Category: events

The Battle of Waterloo was fought on Sunday 18 June 1815, near Waterloo (then in the United Kingdom of the Netherlands, now in Belgium), being the last engagement with Napoleon I. The French Imperial Army under the command of Napoleon I was defeated by two armies of the Seventh Coalition. One was a British-led force with units from the United Kingdom, the Netherlands, Hanover, Brunswick, and Nassau, under the command of field marshal Arthur Wellesley, Duke of Wellington. The other comprised three corps of the Prussian army under Field Marshal Blücher. The battle was known contemporaneously as the Battle of Mont Saint-Jean in France (after the hamlet of Mont-Saint-Jean) and La Belle Alliance in Prussia ("the Beautiful Alliance"; after the inn of La Belle Alliance). Upon Napoleon's return to power in March 1815, the beginning of the Hundred Days, many states that had previously opposed him formed the Seventh Coalition to oppose him again, and hurriedly mobilised their armies. Wellington's and Blücher's armies were cantoned close to the northeastern border of France. Napoleon planned to attack them separately, before they could link up and invade France with other members of the coalition. On 16 June, Napoleon successfully attacked the bulk of the Prussian Army at the Battle of Ligny with his main force, while a small portion of the French Imperial Army contested the Battle of Quatre Bras to prevent the Anglo-allied army from reinforcing the Prussians. The Anglo-allied army held their ground at Quatre Bras but were prevented from reinforcing the Prussians, and on the 17th, the Prussians withdrew from Ligny in good order, while Wellington then withdrew in parallel with the Prussians northward to Waterloo on 17 June. Napoleon sent a third of his forces to pursue the Prussians, which resulted in the separate Battle of Wavre with the Prussian rear-guard on 18–19 June and prevented that French force from participating at Waterloo. Upon learning that the Prussian Army was able to support him, Wellington decided to offer battle on the Mont-Saint-Jean escarpment across the Brussels Road, near the village of Waterloo. Here he withstood repeated attacks by the French throughout the afternoon of 18 June, and was eventually aided by the progressively arriving 50,000 Prussians who attacked the French flank and inflicted heavy casualties. In the evening, Napoleon assaulted the Anglo-allied line with his last reserves, the senior infantry battalions of the Imperial Guard. With the Prussians breaking through on the French right flank, the Anglo-allied army repulsed the Imperial Guard, and the French army was routed. Waterloo was the decisive engagement of the Waterloo campaign and Napoleon's last. It was the second-bloodiest single day battle of the Napoleonic Wars, after Borodino. According to Wellington, the battle was "the nearest-run thing you ever saw in your life". Napoleon abdicated four days later, and coalition forces entered Paris on 7 July. The defeat at Waterloo marked the end of Napoleon's Hundred Days return from exile. It precipitated Napoleon's second and definitive abdication as Emperor of the French, and ended the First French Empire. It set a historical milestone between serial European wars and decades of relative peace, often referred to as the Pax Britannica. In popular culture, the phrase "meeting one's Waterloo" has become an expression for experiencing a catastrophic reversal or undoing.

The Battle of Gettysburg (locally ) (July 1–3, 1863) was fought in the American Civil War between the Union and Confederate armies in and around Gettysburg, Pennsylvania. The battle, won by the Union, is widely considered the Civil War's turning point, leading to an ultimate victory of the Union and the preservation of the nation. The Battle of Gettysburg was the bloodiest battle of both the Civil War and of any battle in American military history up to that time, claiming over 50,000 combined casualties. Union Major General George Meade's Army of the Potomac defeated attacks by Confederate General Robert E. Lee's Army of Northern Virginia, halting Lee's invasion of the North and forcing his retreat. After his success in the Battle of Chancellorsville in Spotsylvania County, Virginia, in May 1863, Lee led his Confederate forces through the Shenandoah Valley to begin the Gettysburg campaign, his second attempt to invade the North. With Lee's army in high spirits, he intended to shift the focus of the summer campaign from war-ravaged Northern Virginia in the hopes of penetrating as far as Harrisburg or Philadelphia, which he hoped would convince northern politicians to end the war. President Abraham Lincoln initially prodded Major General Joseph Hooker into pursuing Lee, then relieved him of command just three days before the Battle of Gettysburg commenced, replacing him with Meade. On July 1, 1863, as Lee's forces moved on Gettysburg in the hopes of destroying the Union army, the two armies encountered each other, and the battle commenced. Low ridges to the northwest of Gettysburg were initially defended by a Union cavalry division under Brigadier General John Buford, soon reinforced by two corps of Union infantry. Two large Confederate corps assaulted them from the northwest and north, however, collapsing the hastily developed Union lines, leading them to retreat through the streets of Gettysburg to the hills just south of the city. On the second day of battle, on July 2, the Union line was laid out in a defensive formation resembling a fishhook. In the late afternoon, Lee launched a heavy assault on the Union's left flank, leading to fierce fighting at Little Round Top, the Wheatfield, Devil's Den, and the Peach Orchard. On the Union's right flank, Confederate demonstrations escalated into full-scale assaults on Culp's Hill and Cemetery Hill. Despite incurring significant losses, Union forces held their lines. On the third day of battle, July 3, fighting resumed on Culp's Hill, and cavalry battles raged to the east and south of Gettysburg. Pickett's Charge featured the main engagement, a Confederate infantry assault of approximately 12,000 Confederate troops, who attacked the center of the Union line at Cemetery Ridge, which was repelled by Union rifle and artillery fire, leading to great Confederate losses. The following day, on the Fourth of July, Lee led his Confederate troops on the torturous retreat from the North. Between 46,000 and 51,000 soldiers from both armies were casualties in the three-day Battle of Gettysburg, the most in any battle in American history up to that time. On November 19, Lincoln traveled to Gettysburg, where he spoke at a ceremony dedicating Gettysburg National Cemetery, which honored the fallen Union soldiers and redefined the purpose of the Civil War in his famed Gettysburg Address, a 271-word speech that has endured as one of the most famous in American history.

The Cuban Missile Crisis, also known as the October Crisis in Cuba (Spanish: Crisis de Octubre), or the Caribbean Crisis (Russian: Карибский кризис, romanized: Karibskiy krizis), was a 13-day confrontation between the governments of the United States and the Soviet Union, when American deployments of nuclear missiles in the United Kingdom, Italy and Turkey were matched by Soviet deployments of nuclear missiles in Cuba. The crisis lasted from 16 to 28 October 1962. The confrontation is widely considered the closest the Cold War came to escalating into full-scale nuclear war. In 1959, the US government deployed Thor nuclear missiles in England, an initiative known as Project Emily. In 1961 the US put Jupiter nuclear missiles in Italy and Turkey. All were within range of Moscow. The US had also trained a paramilitary force of Cuban expatriates, for a CIA-led attempt to invade Cuba and overthrow its government in April 1961. Starting in November of that year, the US government engaged in a violent campaign of terrorism and sabotage in Cuba, referred to as the Cuban Project, which continued throughout the first half of the 1960s. The Soviet administration was concerned about a Cuban drift towards China, with which the Soviets had an increasingly strained relationship. In response to these factors the Soviet and Cuban governments agreed, at a meeting between leaders Nikita Khrushchev and Fidel Castro in July 1962, to place nuclear missiles on Cuba to deter a future US invasion. Construction of launch facilities started shortly thereafter. A U-2 spy plane captured photographic evidence of medium- and long-range launch facilities in October. US president John F. Kennedy convened a meeting of the National Security Council and other key advisers, forming the Executive Committee of the National Security Council (EXCOMM). Kennedy was advised to carry out an air strike on Cuban soil in order to compromise Soviet missile supplies, followed by an invasion of the Cuban mainland. He chose a less aggressive course in order to avoid a declaration of war. On 22 October, Kennedy ordered a naval blockade to prevent further missiles from reaching Cuba. He referred to the blockade as a "quarantine", not as a blockade, so the US could avoid the formal implications of a state of war. An agreement was eventually reached between Kennedy and Khrushchev. The Soviets would dismantle their offensive weapons in Cuba, subject to United Nations verification, in exchange for a US public declaration and agreement not to invade Cuba again. The United States secretly agreed to dismantle all of the offensive weapons it had deployed to Turkey. All Thors in the UK were disbanded by August 1963. While the Soviets dismantled their missiles, some Soviet bombers remained in Cuba, and the United States kept the naval quarantine in place until 20 November 1962. The blockade was formally ended on 20 November after all offensive missiles and bombers had been withdrawn from Cuba. The evident necessity of a quick and direct communication line between the two powers resulted in the Moscow–Washington hotline. A series of agreements later reduced US–Soviet tensions for several years. The compromise embarrassed Khrushchev and the Soviet Union because the withdrawal of US missiles from Italy and Turkey was a secret deal between Kennedy and Khrushchev, and the Soviets were seen as retreating from a situation that they had started. Khrushchev's fall from power two years later was in part because of the Soviet Politburo's embarrassment at both Khrushchev's eventual concessions to the US and his ineptitude in precipitating the crisis. According to the Soviet ambassador to the United States, Anatoly Dobrynin, the top Soviet leadership took the Cuban outcome as "a blow to its prestige bordering on humiliation".

The Manhattan Project was a research and development program undertaken during World War II to produce the first nuclear weapons. It was led by the United States in collaboration with the United Kingdom and Canada. The Manhattan Project employed nearly 130,000 people at its peak and cost nearly US$2 billion (equivalent to about $28 billion in 2024). From 1942 to 1946, the project was directed by Major General Leslie Groves of the U.S. Army Corps of Engineers. Nuclear physicist J. Robert Oppenheimer was the director of the Los Alamos Laboratory that designed the bombs. The Army program was designated the Manhattan District, as its first headquarters were in Manhattan; the name gradually superseded the official codename, Development of Substitute Materials, for the entire project. The project absorbed its earlier British counterpart, Tube Alloys. Over 80 percent of project cost was for building and operating the fissile material production plants. The project proposed both highly enriched uranium and plutonium as fuel for nuclear weapons. Enriched uranium was produced at the Clinton Engineer Works in Tennessee. Plutonium was produced in the world's first industrial-scale nuclear reactors at the Hanford Engineer Works in Washington. These sites were supported by dozens of other facilities across Canada, the US and the UK. The weapons designs were produced at the Los Alamos Laboratory in New Mexico, and resulted in two weapon designs used during the war: Little Boy (enriched uranium gun-type) and Fat Man (plutonium implosion). The Fat Man design was initially a low priority fallback option, as it was complex and required explosive lenses, but in 1944 it was confirmed that plutonium from Hanford was not suitable for a gun-type bomb because of the high proportion of plutonium-240. The first nuclear device ever detonated was an implosion-type bomb during the Trinity test, conducted at White Sands Proving Ground in New Mexico on 16 July 1945. The project was responsible for developing the specific means of delivering the weapons onto military targets, and for the use of the Little Boy and Fat Man bombs in the atomic bombings of Hiroshima and Nagasaki in August 1945. The project was also charged with gathering intelligence on the German nuclear weapon project. Through Operation Alsos, Manhattan Project personnel served in Europe, sometimes behind enemy lines, where they gathered nuclear materials and documents and rounded up German scientists. Despite the Manhattan Project's own emphasis on security, Soviet atomic spies penetrated the program. In the immediate postwar years, the Manhattan Project conducted weapons testing at Bikini Atoll as part of Operation Crossroads, developed new weapons, promoted the development of the network of national laboratories, supported medical research into radiology, and laid the foundations for the nuclear navy. It maintained control over American atomic weapons research and production until the formation of the United States Atomic Energy Commission (AEC) in January 1947.

The Normandy landings were the landing operations and associated airborne operations on 6 June 1944 of the Allied invasion of Normandy in Operation Overlord during the Second World War. Codenamed Operation Neptune and often referred to as D-Day (after the military term), it is the largest seaborne invasion in history. The operation began the liberation of France and the rest of Western Europe, and laid the foundations for the Allied victory on the Western Front. Planning for the operation began in 1943. In the months leading up to the invasion, the Allies conducted a substantial military deception, codenamed Operation Bodyguard, to mislead the Germans as to the date and location of the main Allied landings. The weather on the day selected for D-Day was not ideal, and the operation had to be delayed 24 hours; a further postponement would have meant a delay of at least two weeks, as the planners had requirements for the phase of the moon, the tides, and time of day, that meant only a few days each month were deemed suitable. German leader Adolf Hitler placed Field Marshal Erwin Rommel in command of German forces and developing fortifications along the Atlantic Wall in anticipation of an invasion. US president Franklin D. Roosevelt placed Major General Dwight D. Eisenhower in command of Allied forces. The invasion began shortly after midnight on the morning of 6 June with extensive aerial and naval bombardment as well as an airborne assault—the landing of 24,000 American, British, and Canadian airborne troops. The early morning aerial assault was soon followed by Allied amphibious landings on the coast of France c. 06:30. The target 80-kilometre (50 mi) stretch of the Normandy coast was divided into five sectors: Utah, Omaha, Gold, Juno, and Sword. Strong winds blew the landing craft east of their intended positions, particularly at Utah and Omaha. The men landed under heavy fire from gun emplacements overlooking the beaches, and the shore was mined and covered with obstacles such as wooden stakes, metal tripods, and barbed wire, making the work of the beach-clearing teams difficult and dangerous. The highest number of casualties was at Omaha, with its high cliffs. At Gold, Juno, and Sword, several fortified towns were cleared in house-to-house fighting, and two major gun emplacements at Gold were disabled using specialised tanks. The Allies were able to establish beachheads at each of the five landing sites on the first day, but Carentan, Saint-Lô, and Bayeux remained in German hands. Caen, a major objective, was not captured until 21 July. Only two of the beaches (Juno and Gold) were linked on the first day, and all five beachheads were not connected until 12 June. German casualties on D-Day have been estimated at 4,000 to 9,000 men. Allied casualties were at least 10,000, with 4,414 confirmed dead.

John F. Kennedy, the 35th president of the United States, was assassinated while riding in a presidential motorcade through Dealey Plaza in Dallas, Texas, on Friday, November 22, 1963. Kennedy was in the vehicle with his wife Jacqueline, Texas governor John Connally, and Connally's wife Nellie, when he was fatally shot from the nearby Texas School Book Depository by Lee Harvey Oswald, a former U.S. Marine. The motorcade rushed to Parkland Memorial Hospital, where Kennedy was pronounced dead about 30 minutes after the shooting; Connally was also wounded in the attack but recovered. Vice President Lyndon B. Johnson was hastily sworn in as president two hours and eight minutes later aboard Air Force One at Dallas Love Field. After the assassination, Oswald returned home to retrieve a pistol; he shot and killed a lone Dallas policeman J. D. Tippit shortly afterwards. Around 70 minutes after Kennedy and Connally were shot, Oswald was apprehended by the Dallas Police Department and charged under Texas state law with the murders of Kennedy and Tippit. Two days later, as live television cameras covered Oswald being moved through the basement of Dallas Police Headquarters, he was fatally shot by Dallas nightclub operator Jack Ruby. Like Kennedy, Oswald was taken to Parkland Memorial Hospital, where he soon died. Ruby was convicted of Oswald's murder, though the decision was overturned on appeal, and Ruby died in prison in 1967 while awaiting a new trial. After a 10-month investigation, the Warren Commission concluded that Oswald assassinated Kennedy, and that there was no evidence that either Oswald or Ruby was part of a conspiracy. In 1967, New Orleans district attorney Jim Garrison brought the only trial for Kennedy's murder against businessman Clay Shaw; Shaw was acquitted. Subsequent federal investigations—such as the Rockefeller Commission and Church Committee—agreed with the Warren Commission's general findings. In its 1979 report, the United States House Select Committee on Assassinations (HSCA) concluded that Kennedy was likely "assassinated as a result of a conspiracy". The HSCA did not identify possible conspirators, but concluded that there was "a high probability that two gunmen fired at [the] President". The HSCA's conclusions were largely based on a police Dictabelt recording, which was subsequently debunked by the U.S. Justice Department. Kennedy's assassination is still the subject of widespread debate and has spawned many conspiracy theories and alternative scenarios; polls have found that a vast majority of Americans believe there was a conspiracy. The assassination left a profound impact and was the first of four major assassinations during the 1960s in the United States, coming two years before the assassination of Malcolm X in 1965, and five years before the assassinations of Martin Luther King Jr. and Kennedy's brother Robert F. Kennedy in 1968. Kennedy was the fourth U.S. president to be assassinated and is the most recent to have died in office.

On 26 December 2004, at 07:58:53 local time (UTC+7), a Mw 9.2–9.3 earthquake struck with its epicenter off the west coast of Aceh, in northern Sumatra, Indonesia. The undersea megathrust earthquake, known in the scientific community as the Sumatra–Andaman earthquake, was caused by a rupture along the fault boundary between the Burma plate and the Indian plate, and reached a maximum Mercalli intensity of IX in some areas. The earthquake caused a massive tsunami with waves up to 30 m (100 ft) high, referred to by British and Commonwealth media as the Boxing Day tsunami, after the Boxing Day holiday, or the Asian tsunami, which devastated communities along the surrounding coasts of the Indian Ocean, killing an estimated 227,898 people in 14 countries, especially in Aceh in Indonesia, Sri Lanka, Tamil Nadu in India, and Khao Lak in Thailand. The direct result was severe disruption to living conditions and commerce in coastal provinces of these and other surrounding countries. It is the deadliest tsunami in history, the deadliest natural disaster of the 21st century, and one of the deadliest natural disasters in recorded history. It is also the worst natural disaster in the history of Indonesia, the Maldives, Sri Lanka, and Thailand. The earthquake itself is the most powerful earthquake ever recorded in Asia, the strongest of the 21st century, and the second- or third-most powerful globally since modern seismography began in 1900. It had the longest fault rupture ever observed, between 1,200 to 1,300 kilometres (746 to 808 mi), and had the longest duration of faulting ever observed, lasting at least ten minutes. It caused the entire planet to vibrate by as much as 10 mm (0.4 in), and also remotely triggered earthquakes as far away as Alaska. Its epicentre was located between Simeulue and mainland Sumatra. The plight of the affected people and countries prompted a worldwide humanitarian response, with donations totaling more than US$14 billion (equivalent to US$24 billion in 2025 currency).

A Moon landing or lunar landing is the arrival of a crewed or robotic spacecraft on the Moon. The first human-made object to touch the Moon was Luna 2 in 1959, and the first crewed mission to land on the Moon was Apollo 11 in 1969. There were six crewed landings between 1969 and 1972 and numerous uncrewed landings. All crewed missions to the Moon were conducted by the Apollo program, with the last departing in December 1972. After Luna 24 in 1976, there were no soft landings—landings without significant damage—on the Moon until Chang'e 3 in 2013. All soft landings took place on the near side of the Moon until Chang'e 4 landed on the far side of the Moon in 2019.

Black Thursday is a term used to refer to typically negative, notable events that have occurred on a Thursday. It has been used in the following cases: 6 February 1851, a devastating day of bushfires in Victoria, Australia 21 June 1877, an execution of 10 suspected leaders of the "Molly Maguires" 8 November 1901 (21 November in the Gregorian calendar), the climax of the gospel riots in Athens. 24 October 1929, start of the Wall Street crash of 1929. 14 October 1943, when the USAAF suffered large losses during bombing in the second Schweinfurt raid during World War II 12 April 1951, during the Korean War, when 25% of the Far East Air Force B-29 bombing force were damaged or destroyed by Soviet MiG-15s in MiG Alley. 21 November 1968, day of protests by students at University of Wisconsin-Oshkosh 12 April 1973, clashes between the police and right-wing demonstrators in Milan resulted in the killing of policeman Antonio Marino. 30 May 1975, the massacre of about 50 Lebanese Christians in the area of Bashoura in West Beirut. 22 January 1987, the Mendiola massacre, which claimed the lives of 13 protesters in Manila, Philippines 3 September 1987, known as the "Black Thursday of Warsaw Transit", when 15 people died in two separate rail accidents in Warsaw, Poland 24 July 2003, when former Guatemalan president Efraín Ríos Montt's supporters rioted in protest of a court decision barring him from standing in the 2003 general election 30 September 2009, when the Irish government revealed to its people the alleged full cost of bailing out Anglo-Irish Bank 15 November 2018, the Franco-Ontarian jeudi noir when the government of Ontario announced the elimination of several Franco-Ontarian institutions 12 March 2020, Black Thursday stock market crash A massacre during the 2022 Chadian protests "Black Thursday", the week day preceding Black Friday

Hurricane Katrina was an extremely powerful and catastrophic tropical cyclone that killed 1,392 people and caused damage estimated at $125 billion, particularly in and around the city of New Orleans, in late August 2005. It is tied with Hurricane Harvey as being the costliest tropical cyclone in the Atlantic basin. Katrina was the twelfth tropical cyclone, the fifth hurricane, the third major hurricane, and the second Category 5 hurricane of the 2005 Atlantic hurricane season. It was also the fourth-most intense Atlantic hurricane to make landfall in the contiguous United States, as measured by barometric pressure. Katrina formed on August 23, 2005, with the merger of a tropical wave and the remnants of a tropical depression. After briefly strengthening to a tropical storm over south Florida, Katrina entered the Gulf of Mexico on August 26 and rapidly intensified to a Category 5 hurricane before weakening to a Category 3 at its landfall on August 29 near Buras-Triumph, Louisiana. Eighty percent of New Orleans, as well as large areas in neighboring parishes, were flooded. It is estimated that about 100,000 to 150,000 people remained in the City of New Orleans, despite mandatory evacuation orders. The flooding prompted a massive national and international response effort, including federal, local, and private rescue operations. The largest loss of life was due to flooding caused by engineering flaws in the federally built hurricane protection system, particularly the levees around New Orleans. Investigators concluded that the U.S. Army Corps of Engineers, tasked by Congress in the Flood Control Act of 1965 to design and build the region's hurricane protection, was responsible for the breached floodwalls. Later, a federal appeals court ruled that the Army Corps, despite being responsible, could not be held financially liable due to the Flood Control Act of 1928. The emergency response from federal, state, and local governments was widely criticized, leading to the resignation of Federal Emergency Management Agency (FEMA) director Michael D. Brown and New Orleans Police Department (NOPD) superintendent Eddie Compass. Many other government officials faced criticism for their responses, especially New Orleans mayor Ray Nagin, Louisiana governor Kathleen Blanco, and President George W. Bush. However, several agencies, such as the United States Coast Guard (USCG), National Hurricane Center (NHC), and National Weather Service (NWS), were commended for their actions, with the NHC being particularly praised for its accurate forecasts well in advance. The destruction and loss of life caused by the storm prompted the name Katrina to be retired by the World Meteorological Organization in April 2006. On January 4, 2023, the NHC updated the Katrina fatality data on the basis of a 2014 report, which reduced the total number from an estimated 1,833 to 1,392.

On 26 April 1986, reactor 4 of the Chernobyl Nuclear Power Plant, located near Pripyat, Ukrainian SSR, Soviet Union (later Ukraine), exploded. With dozens of direct casualties and thousands of health complications stemming from the disaster, it is one of only two nuclear accidents rated at the maximum severity on the International Nuclear Event Scale, the other being the 2011 Fukushima nuclear accident. The response involved more than 500,000 personnel and cost an estimated 18 billion rubles (about US$84.5 billion in 2025). It remains the worst nuclear disaster and the most expensive disaster in history, with an estimated cost of US$700 billion. The disaster occurred during a test to simulate cooling the reactor during a serious accident in blackout conditions. The operators carried out the test following an accidental drop in reactor power. Upon shutting down the reactor in those conditions, design flaws led to a dramatic power surge. The reactor components ruptured and lost coolant, and the resulting steam explosions and meltdown destroyed the reactor building. This was followed by a reactor core fire that spread radioactive contaminants across the Soviet Union and Europe. The Soviet government established a 10 km exclusion zone 36 hours after the accident, initially evacuating around 49,000 people. This was later expanded to 30 km, resulting in the evacuation of approximately 68,000 more people. The government did not publicly acknowledge the disaster until two days after the explosion, when elevated radiation levels were detected in Sweden. Following the explosion, which killed two engineers and severely burned two others, an emergency operation began to put out the fires and stabilize the reactor. Of the 237 workers hospitalized, 134 showed symptoms of acute radiation syndrome (ARS); 28 of them died within three months. Over the next decade, 14 more workers (nine of whom had ARS) died of various causes mostly unrelated to radiation exposure. It is the only instance in commercial nuclear power history where radiation-related fatalities occurred. As of 2005, 6000 cases of childhood thyroid cancer occurred within the affected populations (15 of them fatal), "a large fraction" being attributed to the disaster. Long-term death estimates range from up to 4,000 in Ukraine, Belarus, and Russia (per the United Nations) to 16,000 in total across Europe. Pripyat was abandoned and replaced by the purpose-built city of Slavutych. The Chernobyl Nuclear Power Plant sarcophagus, completed in December 1986, reduced the spread of radioactive contamination and provided radiological protection for the crews of the undamaged reactors. In 2016–2018, the Chernobyl New Safe Confinement was constructed around the old sarcophagus to enable the removal of the reactor debris, with clean-up scheduled for completion by 2065.

The September 11 attacks, colloquially known as 9/11, were a coordinated series of suicide attacks perpetrated by the Islamic terrorist organization al-Qaeda against the United States in 2001. Nineteen terrorists hijacked four airliners, then flew one into each of the Twin Towers at the World Trade Center in New York City. The third plane crashed into the Pentagon, the headquarters of the United States Department of Defense, in Arlington County, Virginia. The fourth plane crashed in a rural Pennsylvania field during a passenger revolt. In response to the attacks, the United States launched the global war on terror, seeking to eliminate hostile groups deemed terrorist organizations, and the governments purported to support them. This foreign policy agenda was conducted over the next two decades.Ringleader and hijacker Mohamed Atta flew American Airlines Flight 11 into the North Tower of the World Trade Center complex at 8:46 a.m. At 9:03 a.m., hijacker Marwan al-Shehhi flew United Airlines Flight 175 into the South Tower. Both collapsed within an hour and forty-two minutes, destroying the remaining five structures in the complex. Hijacker Hani Hanjour flew American Airlines Flight 77 into the Pentagon at 9:37 a.m., causing a partial collapse. United Airlines Flight 93, flown by hijacker Ziad Jarrah, was believed to target either the United States Capitol or the White House. Alerted to the previous attacks, the passengers revolted and the hijackers crashed the aircraft into a field near Shanksville, Pennsylvania, at 10:03 a.m. The Federal Aviation Administration ordered a ground stop for all traffic in U.S. airspace, requiring all airborne aircraft to return to their point of origin or divert to Canada. The actions undertaken in Canada to support incoming aircraft and their occupants were collectively titled Operation Yellow Ribbon. That evening, the Central Intelligence Agency informed President George W. Bush that its Counterterrorism Center had identified the attacks as having been the work of al-Qaeda under Osama bin Laden. The United States responded by launching the war on terror and invading Afghanistan. NATO's invocation of Article 5 of the North Atlantic Treaty—its only usage to date—called upon allies to fight al-Qaeda. As U.S. and allied invasion forces swept through Afghanistan, bin Laden eluded them. He denied any involvement until 2004, when excerpts of a taped statement in which he accepted responsibility for the attacks were released. Al-Qaeda's cited motivations included U.S. support of Israel, the presence of U.S. military bases in Saudi Arabia and sanctions against Iraq. The nearly decade-long manhunt for bin Laden concluded in May 2011, when he was killed during a U.S. military raid in Abbottabad, Pakistan. The war in Afghanistan continued for another eight years. The attacks killed 2,977 people, injured thousands more, and gave rise to long-term health consequences, while causing at least US$10 billion in infrastructure and property damage. It remains the deadliest terrorist attack in history, as well as the deadliest incident for firefighters and law enforcement personnel in American history, killing 343 and 72 members, respectively. The crashes of Flight 11 and Flight 175 were the deadliest aviation disasters of all time, and the collision of Flight 77 with the Pentagon resulted in the fourth-highest number of ground fatalities in a plane crash in history. The destruction of the World Trade Center and its environs seriously harmed the U.S. economy and induced global market shocks. Many other countries strengthened anti-terrorism legislation and expanded their powers of law enforcement and intelligence agencies. The total number of deaths caused by the attacks, combined with the death tolls from the conflicts they directly incited, has been estimated by the Costs of War Project to be more than 4.5 million. Cleanup of the World Trade Center site (colloquially known as "Ground Zero") was completed in May 2002, while the Pentagon was repaired within a year. After delays in the design of a replacement complex, six new buildings were planned to replace the lost towers at the World Trade Center site, along with a museum and memorial dedicated to those who were killed or injured in the attacks. The tallest building, One World Trade Center, began construction in 2006, and opened in 2014. Memorials to the attacks include the National September 11 Memorial & Museum in New York City, the Pentagon Memorial in Arlington County, Virginia, and the Flight 93 National Memorial at the Pennsylvania crash site.

The Great Fire of London was a major conflagration that occurred in central London from Sunday 2 September to Wednesday 5 September 1666, gutting the medieval City of London inside the old Roman city wall, while also extending past the wall to the west. The death toll is generally thought to have been relatively small, although some historians have challenged this belief. The fire started in a bakery in Pudding Lane shortly after midnight on Sunday 2 September, and spread rapidly. The use of the major firefighting technique of the time, the creation of firebreaks by means of removing structures in the fire's path, was critically delayed by the hesitation of the Lord Mayor, Sir Thomas Bloodworth. By the time large-scale demolitions were ordered on Sunday night, the wind had already fanned the bakery fire into a firestorm which defeated such measures. The fire pushed north on Monday into the heart of the City. Order in the streets broke down as rumours arose of suspicious foreigners setting fires. The fears of the homeless focused on the French and Dutch, England's enemies in the ongoing Second Anglo-Dutch War; these substantial immigrant groups became victims of street violence. On Tuesday, the fire spread over nearly the whole city, destroying St Paul's Cathedral and leaping the River Fleet to threaten Charles II's court at Whitehall Palace. Coordinated firefighting efforts were simultaneously getting underway. The battle to put out the fire is considered to have been won by two key factors: the strong east wind dropped, and the Tower of London garrison used gunpowder to create effective firebreaks, halting further spread eastward. The social and economic problems created by the disaster were overwhelming. Flight from London and settlement elsewhere were strongly encouraged by Charles II, who feared a London rebellion amongst the dispossessed refugees. Various schemes for rebuilding the city were proposed, some of them radical. After the fire, London was reconstructed on essentially the same medieval street plan, which still exists today.

The assassination of Archduke Franz Ferdinand, also called the Attack in Sarajevo or Sarajevo incident occurred on 28 June 1914 and was one of the key events that led to World War I. Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, were assassinated by Bosnian Serb student Gavrilo Princip. They were shot at close range while being driven through Sarajevo, the provincial capital of Bosnia and Herzegovina, formally annexed by Austria-Hungary in 1908. Princip was part of a group of six Bosnian assassins together with Muhamed Mehmedbašić, Vaso Čubrilović, Nedeljko Čabrinović, Cvjetko Popović and Trifko Grabež coordinated by Danilo Ilić; all but one were Bosnian Serbs and members of a revolutionary movement later known as Young Bosnia. The political objective of the assassination was to free Bosnia and Herzegovina of Austro-Hungarian rule and establish a common South Slav ("Yugoslav") state. The assassination precipitated the July Crisis, which led to Austria-Hungary declaring war on Serbia and the start of World War I. The assassination team was helped by the Black Hand, a Serbian secret nationalist group; support came from Dragutin Dimitrijević, chief of the military intelligence section of the Serbian general staff, as well as from Major Vojislav Tankosić and Rade Malobabić, a Serbian intelligence agent. Tankosić provided bombs and pistols to the assassins and trained them in their use. The assassins were given access to the same clandestine network of safe-houses and agents that Malobabić used for the infiltration of weapons and operatives into Austria-Hungary. The assassins and key members of the clandestine network were tried in Sarajevo in October 1914. In total twenty-five people were indicted. Five of the six assassins were under 20 years old at the time of the assassination, the exception being Mehmedbašić who was 26 or 27. While the group was dominated by Bosnian Serbs, four were Bosnian Croats, one was a Bosnian Muslim and all of them were Austro-Hungarian citizens; none were from Serbia. Princip was found guilty of murder and high treason, but being too young to be executed, was sentenced to 20 years in jail. The four other attackers also received jail terms. Five of the older prisoners were sentenced to be hanged. Black Hand members were arrested and tried before a Serbian court in Salonika in 1917 on charges of high treason, which were later widely regarded as fabricated. The Black Hand was disbanded, and three of its leaders were executed. Much of what is known about the assassinations comes from these two trials and related records. Princip's legacy was re-evaluated following the breakup of Yugoslavia, and public opinion of him in the successor states is largely divided along ethnic lines.

The RMS Titanic sank in the North Atlantic Ocean on 15 April 1912. The largest ocean liner in service at the time, Titanic was four days into her maiden voyage from Southampton, England, to New York City, United States, with over 2,200 people on board when she struck an iceberg at 23:40 (ship's time) on 14 April. She sank two hours and forty minutes later at 02:20 ship's time (05:18 GMT) on 15 April, resulting in the deaths of up to 1,635 people, making it one of the deadliest peacetime maritime disasters in history. Titanic's wireless operators received seven warnings of sea ice leading up to the night of 14 April, but was travelling at a speed of roughly 22 knots (41 km/h; 25 mph) when her lookouts sighted the iceberg. Unable to turn quickly enough, the ship suffered a glancing blow that buckled the steel plates covering her starboard side and opened six of her sixteen compartments to the sea. Titanic had been designed to stay afloat with up to four of her forward compartments flooded, and the crew used distress rockets and wireless messages to attract rescue vessels as the passengers were put into lifeboats. In accordance with existing practice, the Titanic's lifeboat system was not designed to hold everyone on board simultaneously, but rather to ferry passengers to nearby rescue vessels; therefore, with the ship sinking rapidly and help still hours away, there was no safe refuge for many of the passengers and crew, as the ship was equipped with only twenty lifeboats, including four collapsible lifeboats. Poor preparation for, and management of, the evacuation meant many boats were launched before they were completely full. Titanic sank with over a thousand passengers and crew still on board. Almost all of those who ended up in the water died within minutes due to the effects of cold shock and hypothermia. RMS Carpathia arrived about an hour and a half after the sinking and rescued all of the 710 survivors by 09:15 on 15 April. The disaster shocked the world and caused widespread outrage over the shortage of lifeboats and lack of vigilance given to ice warnings the ship had received. Further outrage was aimed at SS Californian who, despite being the closest ship, missed the Titanic's distress calls due to having only one wireless operator aboard. Subsequent inquiries recommended sweeping changes to maritime regulations, including leading to the establishment of the International Convention for the Safety of Life at Sea (SOLAS) in 1914 which still governs maritime safety today.

On 6 and 9 August 1945, the United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki, respectively, during the final days of World War II. The aerial bombings killed 150,000 to 246,000 people, most of whom were civilians, and remain the first and only uses of nuclear weapons in an armed conflict. In the final year of World War II, the Allies prepared for a costly invasion of the Japanese mainland. This undertaking was preceded by a conventional bombing and firebombing campaign that devastated 64 Japanese cities, including an operation on Tokyo. The war in Europe concluded when Germany surrendered on 8 May 1945, and the Allies turned their full attention to the Pacific War. By July 1945, the Allies' Manhattan Project had produced two types of atomic bombs: "Little Boy", an enriched uranium gun-type fission weapon, and "Fat Man", a plutonium implosion-type nuclear weapon. The 509th Composite Group of the U.S. Army Air Forces was trained and equipped with the specialized Silverplate version of the Boeing B-29 Superfortress, and deployed to Tinian in the Mariana Islands. The Allies called for the unconditional surrender of the Imperial Japanese Armed Forces in the Potsdam Declaration on 26 July 1945, the alternative being "prompt and utter destruction". The Japanese government ignored the ultimatum. Japan announced its surrender to the Allies on 15 August, six days after the bombing of Nagasaki and the Soviet Union's declaration of war against Japan and invasion of Manchuria. The Japanese government signed an instrument of surrender on 2 September, ending the war. The consent of the United Kingdom was obtained for the bombing, as was required by the Quebec Agreement, and orders were issued on 25 July by General Thomas T. Handy, the acting chief of staff of the U.S. Army, for atomic bombs to be used on Hiroshima, Kokura, Niigata, and Nagasaki. These targets were chosen because they were large urban areas that also held significant military facilities. On 6 August, a Little Boy was dropped on Hiroshima. Three days later, a Fat Man was dropped on Nagasaki. Over the next two to four months, the effects of the atomic bombings killed 90,000 to 166,000 people in Hiroshima and 60,000 to 80,000 people in Nagasaki; roughly half the deaths occurred on the first day. For months afterward, many people continued to die from the effects of burns, radiation sickness, and other injuries, compounded by illness and malnutrition. Despite Hiroshima's sizable military garrison, estimated at 24,000 troops, some 90% of the dead were civilians. Scholars have extensively studied the effects of the bombings on the social and political character of subsequent world history and popular culture, and there is still much debate concerning the ethical and legal justification for the bombings as well as their ramifications of geopolitics especially with the context of the Cold War. Supporters argue that the atomic bombings were necessary to bring an end to the war with minimal casualties and ultimately prevented a greater loss of life on both sides, and also assert that the demonstration of atomic weaponry created the Long Peace in the interest of preventing a nuclear war. Conversely, critics argue that the bombings were unnecessary for the war's end and were a war crime, raising moral and ethical implications, and also assert that future use of atomic weaponry is more likely than anticipated and could lead to a nuclear holocaust.

The Great Depression was a severe global economic downturn from 1929 to 1939. The period was characterized by high rates of unemployment and poverty, drastic reductions in industrial production and international trade, and widespread bank and business failures around the world. The economic contagion began in 1929 in the United States, the largest economy in the world, with the devastating Wall Street crash of 1929 often considered the beginning of the Depression. Among the countries with the most unemployed were the U.S., the United Kingdom, and Germany. The Depression was preceded by a period of industrial growth and social development known as the "Roaring Twenties". Much of the profit generated by the boom was invested in speculation, such as on the stock market, contributing to growing wealth inequality. Banks were subject to minimal regulation, resulting in loose lending and widespread debt. By 1929, declining spending had led to reductions in manufacturing output and rising unemployment. Share values continued to rise until the October 1929 crash, after which the slide continued until July 1932, accompanied by a loss of confidence in the financial system. By 1933, the U.S. unemployment rate had risen to 25%, about one-third of farmers had lost their land, and 9,000 of its 25,000 banks had gone out of business. President Herbert Hoover was unwilling to intervene heavily in the economy, and in 1930 he signed the Smoot–Hawley Tariff Act, which inadvertently worsened the Depression. In the 1932 presidential election, Hoover was defeated by Franklin D. Roosevelt, who from 1933 pursued a set of expansive New Deal programs in order to provide relief and create jobs. In Germany, which depended heavily on U.S. loans, the crisis caused unemployment to rise to nearly 30% and fueled political extremism, paving the way for Adolf Hitler's Nazi Party to rise to power in 1933. Between 1929 and 1932, worldwide gross domestic product (GDP) fell by an estimated 15%; in the U.S., the Depression resulted in a 30% contraction in GDP. Recovery varied greatly around the world. Some economies, such as the U.S., Germany, and Japan, started to recover by the mid-1930s; others, like France, did not return to pre-shock growth rates until later in the decade. The Depression had devastating economic effects on both wealthy and poor countries: all experienced drops in personal income, prices (deflation), tax revenues, and profits. International trade fell by more than 50%, and unemployment in some countries rose as high as 33%. Cities around the world, especially those dependent on heavy industry, were heavily affected. Construction virtually halted in many countries, and farming communities and rural areas suffered as crop prices fell by up to 60%. Faced with plummeting demand and few job alternatives, areas dependent on primary sector industries suffered the most. The outbreak of World War II in 1939 ended the Depression, as it stimulated factory production, providing jobs for women as militaries absorbed large numbers of young, unemployed men. The precise causes for the Great Depression are disputed. One set of historians, for example, focuses on non-monetary economic causes. Among these, some regard the Wall Street crash itself as the main cause; others consider that the crash was a mere symptom of more general economic trends of the time, which had already been underway in the late 1920s. A contrasting set of views, which rose to prominence in the later part of the 20th century, ascribes a more prominent role to failures of monetary policy. According to those authors, while general economic trends can explain the emergence of the downturn, they fail to account for its severity and longevity; they argue that these were caused by the lack of an adequate response to the crises of liquidity that followed the initial economic shock of 1929 and the subsequent bank failures accompanied by a general collapse of the financial markets.

In 79 AD, Mount Vesuvius, a stratovolcano located in the modern-day region of Campania, Italy, erupted, causing one of the deadliest eruptions in history. Vesuvius violently ejected a cloud of super-heated tephra and gases to a height of 33 km (21 mi), ejecting molten rock, pulverized pumice and hot ash at 1.5 million tons per second, ultimately releasing 100,000 times the thermal energy of the atomic bombings of Hiroshima and Nagasaki. The event gives its name to the Vesuvian type of volcanic eruption, characterised by columns of hot gases and ash reaching the stratosphere, although the event also included pyroclastic flows associated with Peléan eruptions. The event destroyed several Roman towns and settlements in the area. Pompeii and Herculaneum, obliterated and buried underneath massive pyroclastic surges and ashfall deposits, are the most famous examples. Archaeological excavations have revealed much of the towns and the lives of the inhabitants, leading to the area becoming Vesuvius National Park and a UNESCO World Heritage Site. The total population of both cities was over 20,000. The remains of over 1,500 people have been found at Pompeii and Herculaneum. The total death toll from the eruption remains unknown. A detailed firsthand account of the eruption is preserved in two letters of Pliny the Younger, who personally witnessed the event from the town of Misenum.

The Berlin Wall fell on 9 November 1989 during the Peaceful Revolution, marking the beginning of the destruction of the figurative Iron Curtain, as East Berlin transit restrictions were overwhelmed and discarded. Sections of the wall were breached, and planned deconstruction began the following June. It was one of the series of events that started the fall of communism in Central and Eastern Europe. The fall of the inner German border took place shortly afterward. An end to the Cold War was declared at the Malta Summit in early December, and German reunification took place in October the following year.

The global COVID-19 pandemic (also known as the coronavirus pandemic), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), began with an outbreak in Wuhan, China, in December 2019. It spread to other parts of Asia and then worldwide in early 2020. The World Health Organization (WHO) declared the outbreak a public health emergency of international concern (PHEIC) on 30 January 2020 and assessed it as having become a pandemic on 11 March. The WHO declared that the public health emergency caused by COVID-19 had ended in May 2023, while noting that COVID-19 continued to be a global health threat. COVID-19 symptoms range from asymptomatic to deadly, but most commonly include fever, sore throat, nocturnal cough, and fatigue. Transmission of the virus is often through airborne particles. Mutations have produced many strains (variants) with varying degrees of infectivity and virulence. COVID-19 vaccines were developed rapidly and deployed to the general public beginning in December 2020, made available through government and international programmes such as COVAX, aiming to provide vaccine equity. Treatments include novel antiviral drugs and symptom control. Common mitigation measures during the public health emergency included travel restrictions, lockdowns, business restrictions and closures, workplace hazard controls, mask mandates, quarantines, testing systems, and contact tracing of the infected. The pandemic caused severe social and economic disruption around the world, including the largest global recession since the Great Depression. Widespread supply shortages, including food shortages, were caused by supply chain disruptions and panic buying. Reduced human activity led to an unprecedented temporary decrease in pollution. Educational institutions and public areas were partially or fully closed in many jurisdictions, and many events were cancelled or postponed during 2020 and 2021. Telework became much more common for white-collar workers as the pandemic evolved. Misinformation circulated through social media and occasionally through mass media, and political tensions intensified. The pandemic raised issues of racial and geographic discrimination, health equity, and the balance between public health imperatives and individual rights. The disease has continued to circulate since 2023. By 2025, experts generally believed the pandemic to be over, having transitioned into the endemic phase. Different definitions of pandemics lead to different determinations of when they end. As of 28 May 2026, COVID-19 has caused 7,114,238 confirmed deaths and 18.5 to 35.2 million estimated deaths. The pandemic was the fifth-deadliest pandemic or epidemic in history.

The American Revolution (1765–1789) was a political movement in the Thirteen Colonies of Great Britain. The movement began as a rebellion and evolved into a revolution resulting in the sovereign United States. These changes were the outcome of the associated American Revolutionary War. The Second Continental Congress, as the provisional government, established the Continental Army and appointed George Washington as its commander-in-chief in 1775. The following year, the Congress passed the Lee Resolution on July 2nd, then unanimously adopted the Declaration of Independence on the Fourth of July. Throughout most of the war, the outcome appeared uncertain. However, in 1781, a decisive victory by Washington and the Continental Army in the Siege of Yorktown led King George III and the Fox–North coalition in government to negotiate the cessation of colonial rule and the acknowledgment of American sovereignty, formalized in the Treaty of Paris in 1783. The Constitution took effect in 1789 and the Bill of Rights was ratified in 1791. Discontent with colonial rule began shortly after the French and Indian War ended in 1763. Even though the colonies had fought in and supported the war directly with troops, funds and material, the British Parliament imposed new taxes to ostensibly compensate for wartime costs, and transferred control of the colonies' western lands to British officials in Montreal. Representatives from several colonies convened in New York City for the Stamp Act Congress in 1765; its "Declaration of Rights and Grievances" argued that this taxation without representation in Parliament and other policies violated their rights as Englishmen. In 1767, though the Stamp Act was repealed, tensions flared again following Parliament's passage of the Townshend Acts. In an effort to quell the mounting rebellion, King George III deployed British troops to the colony of Massachusetts, where they killed antagonists in the 1770 Boston Massacre. In December 1773, the local faction of the colonies-wide Sons of Liberty underground orchestrated the Boston Tea Party, during which they dumped chests of taxed tea owned by the British East India Company into Boston Harbor. Parliament responded by enacting a series of punitive laws, intended to end self-government in Massachusetts, but instead increased American support for the revolutionary cause. In 1774, twelve of the Thirteen Colonies sent delegates to the First Continental Congress; the Province of Georgia joined in 1775. The First Continental Congress began coordinating Patriot resistance through underground networks of committees largely built on the foundations of the Sons of Liberty network. In August 1775, King George III proclaimed Massachusetts to be in a state of rebellion. The British attempted to disarm the colonists, resulting in the Battles of Lexington and Concord, sparking the Revolutionary War. The Second Continental Congress convened in May of 1775 and created the Continental Army, which then surrounded Boston, forcing the British to withdraw by sea in March 1776 and leaving Patriots in control in every colony. In May 1776, Congress voted to suppress all forms of Crown authority, to be replaced by locally created authority, and each colony created a state constitution. On July 2, the Congress passed the Lee Resolution, affirming their support for national independence. On July 4, 1776 they unanimously adopted the Declaration of Independence, famously proclaiming that "all men are created equal", having then evolved from a rebellion over British rights to a revolution based on universal rights. The Congress soon after began deliberating the Articles of Confederation, an effort to establish a multi-state self-governing coordinating body capable of negotiating international treaties and prosecuting the war. The Revolutionary War continued for another five years during which France ultimately entered, supporting the revolutionary cause. On September 28, 1781, Washington commanded the Continental Army's capture of a British army under General Cornwallis at the Siege of Yorktown, leading to the collapse of King George's control of Parliament. Consensus in Parliament soon shifted to the war ending on American terms. On September 3, 1783, the British signed the Treaty of Paris, recognizing the sovereign independence of the United States, and ceding to the new nation nearly all the territory east of the Mississippi River and south of the Great Lakes. The United States became the first nation to establish a federal republic with a written constitution based on the principles of universal natural rights, consent of the governed, and equality under the law, albeit with significant democratic limitations compared to later evolution of the concept.

The Russian Revolution was a period of political and social change in Russia, starting in 1917. This period saw Russia abolish its monarchy and adopt a socialist form of government following two successive revolutions and a civil war. It can be seen as the precursor for other revolutions that occurred in the aftermath of World War I, such as the German Revolution of 1918–1919. The Russian Revolution was a key event of the 20th century. The Russian Revolution was inaugurated with the February Revolution in 1917, in the midst of World War I. With the German Empire inflicting defeats on the front, and increasing logistical problems causing shortages of bread and grain, the Russian Army was losing morale, with large scale mutiny looming. Officials were convinced that if Tsar Nicholas II abdicated, the unrest would subside. Nicholas stepped down on 15 March [O.S. 2 March], ushering in a provisional government led by the Duma (parliament). During the unrest, Soviet councils were formed by locals in Petrograd (now Saint Petersburg) that initially did not oppose the new government; however, the Soviets insisted on their influence in the government and control over militias. By March, Russia had two rival governments. The Provisional Government held state power in military and international affairs, whereas the network of Soviets held domestic power. Critically, the Soviets held the allegiance of the working class, and urban middle class. There were mutinies, protests and strikes. Socialist and other leftist political organizations competed for influence within the Provisional Government and Soviets. Factions included the Mensheviks, Socialist Revolutionaries, Anarchists, and the Bolsheviks, a far-left party led by Vladimir Lenin. The Bolsheviks won popularity with their program promising peace, land, and bread: an end to the war, land for the peasantry, and ending famine. After assuming power, the Provisional Government continued fighting the war in spite of public opposition. Taking advantage, the Bolsheviks and other factions gained popular support to advance the revolution. Responding to discontent in Petrograd, the Provisional Government repressed protestors leading to the July Days. The Bolsheviks merged workers' militias loyal to them into the Red Guards. The volatile situation reached its climax with the October Revolution, a Bolshevik armed insurrection in Petrograd beginning 7 November [O.S. 25 October] that overthrew the Provisional Government. The Bolsheviks established their own government and proclaimed the establishment of the Russian Soviet Federative Socialist Republic (RSFSR). Under pressure from German military offensives, the Bolsheviks relocated the capital to Moscow. The RSFSR began reorganizing the empire into the world's first socialist state, to practice soviet democracy on a national and international scale. Their promise to end Russia's participation in World War I was fulfilled when Bolshevik leaders signed the Treaty of Brest-Litovsk with Germany in March 1918. The Bolsheviks established the Cheka, a secret police and revolutionary security service working to uncover, punish, and eliminate those considered to be "enemies of the people" in campaigns called the Red Terror. Although the Bolsheviks held large support in urban areas, they had foreign and domestic enemies that refused to recognize their government. Russia erupted into a bloody civil war, which pitted the Reds (Bolsheviks), against their enemies, which included nationalist movements, anti-Bolshevik socialist parties, anarchists, monarchists and liberals; the latter two parties strongly supported the Russian White movement which was led mainly by right-leaning officers and seen as fighting for the restoration of the imperial order. The Bolshevik commissar Leon Trotsky began organizing workers' militias loyal to the Bolsheviks into the Red Army. While key events occurred in Moscow and Petrograd, every city in the empire was convulsed, including the provinces of national minorities, and in the rural areas peasants took over and redistributed land. As the war progressed, the RSFSR established Soviet power in Armenia, Azerbaijan, Byelorussia, Georgia, and Ukraine. Wartime cohesion and intervention from foreign powers prompted the RSFSR to begin unifying these nations under one flag and created the Soviet Union. Historians consider the end of the revolutionary period to be in 1922, when the civil war concluded with the defeat of the White Army and separatist factions, leading to mass emigration from Russia. The victorious Bolshevik Party reconstituted itself into the All-Union Communist Party (Bolsheviks) and remained in power for six decades.

The Fall of Constantinople, also known as the Conquest of Constantinople, was the capture of Constantinople, the capital city of the Byzantine Empire, by the Ottoman Empire. The city was captured on 29 May 1453 as part of the culmination of a 53-day siege which had begun on 6 April. The attacking Ottoman Army, which significantly outnumbered Constantinople's defenders, was commanded by Sultan Mehmed II (later nicknamed "the Conqueror"), while the Byzantine army was led by Emperor Constantine XI Palaiologos. After conquering the city, Mehmed II made Constantinople the new Ottoman capital, replacing Adrianople. The fall of Constantinople and of the Byzantine Empire was a watershed moment of the Late Middle Ages, marking the effective end of the Roman Empire, a state which began in roughly 27 BC and had lasted nearly 1,500 years. For many modern historians, the fall of Constantinople marks the end of the medieval period and the beginning of the early modern period. The city's fall also stood as a turning point in military history. Since ancient times, cities and castles had depended upon ramparts and walls to repel invaders. The walls of Constantinople, especially the Theodosian walls, protected Constantinople from attack for 800 years and were noted as some of the most advanced defensive systems in the world at the time. However, these fortifications were overcome by Ottoman infantry with the support of gunpowder, specifically from cannons and bombards, heralding a change in siege warfare. The Ottoman cannons repeatedly fired massive cannonballs weighing 500 kilograms (1,100 lb) over 1.5 kilometres (0.93 mi) which created gaps in the Theodosian walls for the Ottoman siege.

The partition of India in 1947 was the division of British India into two independent dominion states, the Union of India and Dominion of Pakistan. The Union of India is today the Republic of India, and the Dominion of Pakistan is the Islamic Republic of Pakistan and the People's Republic of Bangladesh. The partition involved the division of two provinces, Bengal and the Punjab, based on district-wide non-Muslim (mostly Hindu and Sikh) or Muslim majorities. It also involved the division of the British Indian Army, the Royal Indian Navy, the Indian Civil Service, the railways, and the central treasury, between the two new dominions. The partition was set forth in the Indian Independence Act 1947 and resulted in the end of the British Raj, or Crown rule in India. The two self-governing countries of India and Pakistan legally came into existence at midnight on 14–15 August 1947. With the partition of British India and withdrawal of the British from the Indian subcontinent, the Indian Independence Act provided that the princely states were released from their subsidiary alliances and other obligations to the British, while the British withdrew from their obligations to the states, leaving the rulers to decide whether to accede to India or Pakistan or to remain independent outside both. Sardar Patel said in a speech in January 1948, "On the lapse of Paramountcy, every Indian State became a separate independent entity." The political integration of the princely states into the two new dominions was begun by many accessions in August 1947, but mostly it followed on later. Critically, the rulers of the states of Hyderabad, Jammu and Kashmir, and others, chose independence. The partition displaced between 12 and 20 million people along religious lines, creating overwhelming refugee crises associated with the mass migration and population transfer that occurred across the newly constituted dominions; there was large-scale violence, with disputed estimates of the loss of life before, at the time of, or following the partition. As of 2009, the estimates still varied between two hundred thousand and two million. The violent nature of the partition created an atmosphere of hostility and suspicion between India and Pakistan that plagues Indo-Pakistani relations to the present. The term partition of India does not cover the earlier separations of Burma (now Myanmar) and Ceylon (now Sri Lanka) from the administration of British India. It does not cover the incorporation of the enclaves of French India into India during the period 1947–1954, nor the annexation of Goa and other districts of Portuguese India by India in 1961. Other contemporaneous political entities in the region in 1947, such as Sikkim, Bhutan, Nepal, and the Maldives, were unaffected by the partition. The secession of Bangladesh from Pakistan in 1971 was a later partition of Pakistan, and not of India.

The Boston Tea Party was an act of protest on December 16, 1773 during the American Revolution. Initiated by the Sons of Liberty in Boston, the capital of Massachusetts, one of the Thirteen Colonies of British America, it escalated hostilities between Great Britain and the Patriots, who opposed British policy towards its American colonies. Less than two years later, on April 19, 1775, the Battles of Lexington and Concord, also in Massachusetts, launched the eight-year American Revolutionary War, which resulted in the independence of the colonies as the United States. The source of the protestors' anger was the passage of the Tea Act by the Parliament of Great Britain on May 10, 1773, which allowed the East India Company (EIC) to sell Chinese tea in the colonies without paying taxes apart from those imposed by the Townshend Acts. The Sons of Liberty strongly opposed both the Tea Act and Townshend Acts, which they saw as a violation of their "rights as Englishmen" to no taxation without representation. Disguised as Native Americans, on the night of December 16 members of Sons of Liberty boarded the Dartmouth, a merchantman that had docked in Boston carrying a major shipment of EIC tea, and set about throwing 340 or 342 chests of the tea into Boston Harbor. The British government considered the protest an act of treason and responded with several punitive measures. Nine days later, on December 25, during the Philadelphia Tea Party, a group of Patriots forced the merchantmen Polly, which was transporting a shipment of tea, to return to England without unloading her cargo. Parliament responded in 1774 with the Intolerable Acts, which, among other provisions, ended local self-government in Massachusetts and closed Boston's commerce. Colonists throughout the Thirteen Colonies responded to the Intolerable Acts with additional acts of protest, and by convening the First Continental Congress in Philadelphia, which sent a Petition to the King for repeal of the acts and coordinated colonial resistance to them, culminating in the October 1774 Continental Association.