Category: politics

Anarchism is a political philosophy and movement that seeks to abolish all institutions that perpetuate authority, coercion, or hierarchy, primarily targeting the state and capitalism. Anarchism advocates for the replacement of the state with stateless societies and voluntary free associations. Anarchism is described as being part of the libertarian wing of the socialist movement (libertarian socialism). Although traces of anarchist ideas are found all throughout history, modern anarchism emerged from the Enlightenment. During the latter half of the 19th and the first decades of the 20th century, the anarchist movement flourished in most parts of the world and had a significant role in workers' struggles for emancipation. Various anarchist schools of thought formed during this period. Anarchists have taken part in several revolutions, most notably in the Paris Commune, the Russian Civil War and the Spanish Civil War, whose conclusion marked the end of the classical era of anarchism. In the last decades of the 20th and into the 21st century, the anarchist movement has been resurgent, growing in popularity and influence within anti-capitalist, anti-war and anti-globalisation movements. Anarchists employ a range of approaches to social change, often categorised as revolutionary or evolutionary, though the two frequently overlap and are reflected in a diversity of tactics. Evolutionary approaches generally favour gradual and often nonviolent change, while revolutionary approaches seek to destroy oppressive states and institutions. Many facets of human civilisation have been influenced by anarchist theory, critique, and praxis.

A constitution, or supreme law, is the aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organization or other type of entity, and commonly determines how that entity is to be governed. When these principles are written down into a single document or set of legal documents, those documents may be said to embody a written constitution; if they are encompassed in a single comprehensive document, it is said to embody a codified constitution. The constitution of the United Kingdom is a notable example of an uncodified constitution; it is instead written in numerous fundamental acts of a legislature, court cases, and treaties. Constitutions concern different levels of organizations, from sovereign countries to companies and unincorporated associations. A treaty that establishes an international organization is also its constitution, in that it would define how that organization is constituted. Within states, a constitution defines the principles upon which the state is based, the procedure in which laws are made, and by whom. Some constitutions, especially codified constitutions, also act as limiters of state power, by establishing lines which a state's rulers cannot cross, such as fundamental rights. Changes to constitutions frequently require consensus or supermajority. The Constitution of India is the longest written constitution of any country in the world, with 146,385 words in its English-language version, while the Constitution of Monaco is the shortest written constitution with 3,814 words. The Constitution of San Marino might be the world's oldest active written constitution, since some of its core documents have been in operation since 1600, while the Constitution of the United States is the oldest active codified constitution. The historical life expectancy of a written constitution since 1789 is approximately 19 years. There are also varieties of constitutions, for example liberal constitutions and communist state constitutions.

Capitalism is an economic system based on the private ownership of the means of production and its use for the purpose of obtaining profit. This socioeconomic system has developed historically in several stages and is defined by a number of constituent elements: private property, profit motive, capital accumulation, competitive markets, commodification, wage labor, and an emphasis on innovation and economic growth. Capitalist economies may experience business cycles of economic expansion followed by recessions. Economists, historians, political economists, and sociologists have adopted different perspectives in their analyses of capitalism and have recognized various forms of it in practice. These include laissez-faire capitalism, free-market capitalism, state capitalism, and welfare capitalism. Different forms of capitalism feature varying degrees of free markets, public ownership, barriers to free competition, and state-sanctioned social policies. The degree of competition in markets, the role of intervention and regulation, and the scope of state ownership vary across different models of capitalism. The extent to which markets are free and the rules defining private property are matters of politics and policy. Most of the existing economies in the world today are mixed economies that combine elements of free markets with state intervention and, in some cases, economic planning. Capitalism in its modern form emerged from agrarianism in England, as well as from mercantilist practices in European countries between the 16th and 18th centuries. The Industrial Revolution of the 18th century established capitalism as a dominant mode of production characterized by factory work and a complex division of labor. Through globalization, capitalism spread across the world in the 19th and 20th centuries, especially before World War I and again after the end of the Cold War. During the 19th century, capitalism was largely unregulated by the state but became more regulated in the post–World War II period through Keynesianism, followed by a return of more unregulated capitalism termed neoliberalism starting in the 1980s.

Conservatism is a cultural, social, and political philosophy and ideology that seeks to promote and preserve traditional institutions, customs, and values. The central tenets of conservatism may vary in relation to the culture and civilization in which it appears. In Western culture, depending on the particular nation and the particular time period, conservatives seek to promote and preserve a range of institutions, such as the nuclear family, organized religion, the military, the nation-state, property rights, rule of law, aristocracy, and monarchy. The 18th-century Anglo-Irish statesman Edmund Burke, who opposed the French Revolution but supported the American Revolution, is credited as one of the forefathers of conservative thought in the 1790s along with Savoyard statesman Joseph de Maistre. The first established use of the term in a political context originated in 1818 with François-René de Chateaubriand during the period of Bourbon Restoration that sought to roll back the policies of the French Revolution and establish social order. Conservatism has varied considerably as it has adapted itself to existing traditions and national cultures. Thus, conservatives from different parts of the world, each upholding their respective traditions, may disagree on a wide range of issues. One of the three major ideologies along with liberalism and socialism, conservatism is the dominant ideology in many nations across the world, including Hungary, India, Iran, Israel, Italy, Japan, Poland, Russia, United States, Singapore, and South Korea. Historically associated with right-wing politics, the term has been used to describe a wide range of views. Conservatism may be either libertarian or authoritarian, populist or elitist, progressive or reactionary, moderate or extreme.

Colonialism is the practice of extending and maintaining political, social, economic, and cultural domination over a territory and its people by another people in pursuit of interests defined in an often distant metropole, who also claim superiority. While frequently an imperialist project, colonialism functions through differentiating between the targeted land and people, and that of the colonizers (a critical component of colonization). Rather than annexation, this typically culminates in organizing the colonized into colonies separate to the colonizers' metropole. Colonialism sometimes deepens by developing settler colonialism, whereby settlers from one or multiple colonizing metropoles occupy a territory with the intention of partially or completely supplanting the existing Indigenous peoples, possibly amounting to genocide. Colonialism monopolizes power by understanding conquered land and people to be inferior, based on beliefs of entitlement and superiority, justified with beliefs of having a civilizing mission to cultivate land and life, historically often rooted in the belief of a Christian mission. These beliefs and the actual colonization establish a so-called coloniality, which keeps the colonized socio-economically othered and subaltern through modern biopolitics of sexuality, gender, race, disability, and class, among others, resulting in intersectional violence and discrimination. While different forms of colonialism have existed around the world, the concept has been developed as a description of European colonial empires of the modern era. These spread globally from the 15th century to the mid-20th century, spanning 35% of Earth's land by 1800 and peaking at 84% by the beginning of World War I. European colonialism employed mercantilism and chartered companies, and established complex colonialities. Decolonization, which started in the 18th century, gradually led to the independence of colonies in waves, with a particular large wave of decolonizations happening in the aftermath of World War II between 1945 and 1975. Colonialism has a persistent impact on a wide range of modern outcomes, as scholars have shown that variations in colonial institutions can account for variations in economic development, regime types, and state capacity. Some academics have used the term neocolonialism to describe the continuation or imposition of elements of colonial rule through indirect means in the contemporary period.

The European Union (EU) is a political and economic union of 27 member states that are located primarily in Europe. A supranational union with a total area of 4,233,255 km2 (1,634,469 sq mi) and an estimated population of over 450 million as of 2025, its member states generated a nominal gross domestic product (GDP) of around €18.802 trillion in 2025, accounting for approximately one sixth of global economic output. The EU is often described as a sui generis political entity combining characteristics of both a federation and a confederation. Its cornerstone, the Customs Union, paved the way to establishing an internal single market based on standardised legal framework and legislation that applies in all member states in those matters, and only those matters, where the states have agreed to act as one. EU policies aim to ensure the free movement of people, goods, services and capital within the internal market; enact legislation in justice and home affairs; and maintain common policies on trade, agriculture, fisheries, and regional development. Passport controls have been abolished for travel within the Schengen Area. The eurozone is a group composed of the 21 EU member states that have fully implemented the EU's economic and monetary union and use the euro currency. Through the Common Foreign and Security Policy, the union has developed a role in external relations and defence. It maintains permanent diplomatic missions throughout the world and represents itself at the United Nations, the World Trade Organization, the G7 and the G20. In 2012, the EU was awarded the Nobel Peace Prize. The EU was established, along with its citizenship, when the Maastricht Treaty came into force in 1993, and was incorporated as an international legal juridical person upon entry into force of the Treaty of Lisbon in 2009. Its beginnings can be traced to the Inner Six states (Belgium, France, Italy, Luxembourg, the Netherlands, and West Germany) at the start of modern European integration in 1948, and to the Western Union, the International Authority for the Ruhr, the European Coal and Steel Community, the European Economic Community and the European Atomic Energy Community, which were established by treaties. These increasingly amalgamated bodies grew, with their legal successor the EU, both in size through the accessions of a further 22 states from 1973 to 2013, and in power through acquisitions of policy areas. In 2020, the United Kingdom became the only member state to leave the EU; ten countries are aspiring or negotiating to join it.

An election is a formal group decision-making process whereby a portion or all of a population or group votes to choose an individual or multiple individuals to hold public office or other position of responsibility. Elections have been the usual mechanism by which modern representative democracy has operated since the 17th century. Elections may fill offices in the legislature, sometimes in the executive and judiciary, and for regional and local government, such as cities or towns. This process is also used in many other Standardized Associations, public businesses, and organizations, from clubs to voluntary association and corporations. The global use of elections as a tool for selecting representatives in modern representative democracies is in contrast with the practice in the democratic archetype, ancient Athens, where the elections were considered an oligarchic institution and most political offices were filled using allotment which is also known as "Sortition", by which office holders were chosen by lot. Electoral reform describes the process of introducing fair electoral systems where they are not in place, or improving the fairness or effectiveness of existing systems. Psephology is the study of results and other statistics relating to elections (especially with a view to predicting future results). The term elect means "to select or to nominate", so sometimes other forms of balloting such as referendums are referred to as elections, especially in the United States.

Fascism ( FASH-iz-əm) is a far-right, authoritarian, and ultranationalist political ideology and movement that rose to prominence in early-20th-century Europe. Fascism is characterized by support for a dictatorial leader, centralized autocracy, militarism, forcible suppression of opposition, belief in a natural social hierarchy, subordination of individual interests for the perceived interest of the nation or race, and strong regimentation of society and the economy. Opposed to communism, democracy, liberalism, pluralism, and socialism, fascism is at the far-right of the traditional left–right spectrum. What constitutes a precise definition of fascism has been a longrunning and complex debate among scholars. The first fascist movements emerged in Italy during World War I before spreading to other European countries, most notably Germany. Fascism also had adherents outside of Europe. Fascists saw World War I as a revolution that brought massive changes to the nature of war, society, the state, and technology. The advent of total war and the mass mobilization of society erased the distinction between civilians and combatants. A military citizenship arose, in which all citizens were involved with the military in some manner. The war resulted in the rise of a powerful state capable of mobilizing millions of people to serve on the front lines, providing logistics to support them, and having unprecedented authority to intervene in the lives of citizens. Fascism views forms of violence—including political violence, imperialist violence, and war—as means to national rejuvenation. Fascists often advocate for the establishment of a totalitarian one-party state, and for a dirigiste economy, which is a market economy in which the state plays a strong directive role through market intervention with the principal goal of achieving national economic self-sufficiency, or "autarky". Fascism emphasizes both palingenesis—national rebirth or regeneration—and modernity when it is deemed compatible with national rebirth. In promoting the nation's regeneration, fascists seek to purge it of decadence. Fascism may also centre around an ingroup-outgroup opposition and demonization of "Others", such as various ethnicities, immigrants, nations, races, political opponents of fascist parties, religious groups, and sexual and gender minorities. In the case of Nazism, this involved racial purity and a belief in a master race. Such demonization has motivated fascist regimes to commit massacres, forced sterilizations, deportations, and genocides. During World War II, the genocidal and imperialist ambitions of the fascist regimes of the Axis powers resulted in the murder of millions of people. Since the end of World War II in 1945, fascism has been largely disgraced, and few parties have openly described themselves as fascist; the term is often used pejoratively by political opponents. The descriptions neo-fascist or post-fascist are sometimes applied to contemporary parties with ideologies similar to, or rooted in, 20th-century fascist movements.

Human rights are universally recognized moral principles or norms that establish standards of human behavior and are often protected by both national and international laws. These rights are considered inherent and inalienable, meaning they belong to every individual simply by virtue of being human. They encompass a broad range of civil, political, economic, social, and cultural rights, such as the right to life, freedom of speech, protection against enslavement, and right to education. While ideas related to human rights predate modernity, the modern concept of human rights gained significant prominence after World War II, particularly in response to the atrocities of the Holocaust, leading to the adoption of the Universal Declaration of Human Rights (UDHR) by the United Nations General Assembly in 1948. This document outlined a comprehensive framework of rights that countries are encouraged to protect, setting a global standard for human dignity, freedom, and justice. The Universal Declaration of Human Rights (UDHR) has since inspired numerous international treaties and national laws aimed at promoting and protecting human rights worldwide. While the principle of universal human rights is widely accepted, debates persist regarding which rights should take precedence, how they should be implemented, and their applicability in different cultural contexts. Criticisms often arise from perspectives like cultural relativism, which argue that individual human rights are inappropriate for societies that prioritize a communal or collectivist identity, and may conflict with certain cultural or traditional practices. Nonetheless, human rights remain a central focus in international relations and legal frameworks, supported by institutions such as the United Nations, various non-governmental organizations, and national bodies dedicated to monitoring and enforcing human rights standards worldwide.

Imperialism is the maintaining and extending of power over foreign nations, particularly through expansionism, employing both hard power (military and economic power) and soft power (diplomatic power and cultural imperialism). Imperialism focuses on establishing or maintaining hegemony and a more formal empire. While related to the concept of colonialism, imperialism is a distinct concept that can apply to other forms of expansion and many forms of government. Kenneth Waltz suggests that the root cause of imperialism is great power. He explains that "[w]here one finds empires, one notices that they are built by those who have organized themselves and exploited their resources most effectively," adding that "[w]eakness invites control; strength tempts one to exercise it, even if only for the 'good' of other people." According to Vladimir Lenin, imperialist wars are inevitable due to uneven development under capitalism.

The North Atlantic Treaty Organization (NATO) is an intergovernmental military alliance between 32 member states—30 in Europe and two in North America. Founded in the aftermath of World War II, NATO was established with the signing of the North Atlantic Treaty in 1949. The organization serves as a system of collective security and deterrence, whereby its independent members agree to defend each-other from attack by any outside party. This is enshrined in Article 5 of the treaty, which states that an armed attack against the territory of one member shall be considered an attack against them all. Throughout the Cold War, NATO's primary purpose was to deter and counter the threat posed by the Soviet Union and its satellite states, which formed the rival Warsaw Pact in 1955. Following the dissolution of the Soviet Union in 1991, the alliance adapted. NATO undertook its first military intervention in the Bosnian War (1992–1995); with a United Nations mandate, it enforced a no-fly zone and defended UN safe zones. NATO also intervened in the Kosovo War in 1999 by bombing Yugoslavia with the stated goal of ending the violence and repressive actions by the Milošević government. Article 5 was invoked for the first and only time by the United States, after the September 11 attacks, leading to the NATO invasion of Afghanistan in 2001, as part of the International Security Assistance Force (ISAF). In 2011, NATO intervened in the Libyan civil war, with a UN mandate to enforce a no-fly zone and protect civilians. The alliance has since been involved in training Iraq's military and countering piracy. Since the end of the Cold War, the alliance has accepted sixteen new members in Europe. NATO recognizes Bosnia and Herzegovina, Ukraine and Georgia as aspiring members. Russia–NATO relations had been co-operative, but became adversarial during Vladimir Putin's second presidency. Putin called NATO's eastward enlargement a threat, and opposes Ukraine joining the alliance. Following the Russian annexation of Crimea in 2014, NATO suspended co-operation and deployed a tripwire force in the east. The 2022 Russian invasion of Ukraine prompted NATO to reinforce its eastern flank and send military aid to Ukraine. The invasion caused Finland and Sweden to join the alliance. Since the invasion, Russia has been accused of waging a hybrid conflict against NATO. Since 2025, there has been internal crisis in NATO due to threats made by the United States, a major contributing member, against the sovereignty of fellow members Canada and Denmark. NATO members contribute to collective defense in two ways: by funding their own defense, and by helping to fund a shared budget for running the organization as a whole and maintaining joint facilities. Each member has committed to a target of spending at least 5% of their gross domestic product (GDP) on their own defense, while in 2026 the shared budget was around €5 billion split between all 32 members. As of 2026, the United States spends the most overall on its defense, Norway spends the most per capita, while Poland and the Baltic states spend the most as a share of GDP. The combined military spending of NATO members makes up over half of the world total. The combined militaries of all NATO members include about 3.5 million soldiers and personnel. NATO's main headquarters are in Brussels, Belgium, while its military headquarters are near Mons, Belgium.

Nationalism is an ideology or movement that holds that the nation should be congruent with the state. As a movement, it presupposes the existence and tends to promote the interests of a particular nation, especially with the aim of gaining and maintaining its sovereignty (self-determination) over its perceived homeland to create a nation-state. It holds that the nation should govern itself, free from outside interference (self-governance), that a nation is a natural and ideal basis for a polity, and that the nation is the only rightful source of political power. It further aims to build, and maintain, a single national identity, based on a combination of shared social characteristics such as culture, ethnicity, homeland, language, politics (or government), religion, traditions, or belief in a shared singular history, and to promote national unity or solidarity. There are various definitions of a "nation", which leads to different types of nationalism. The two main divergent forms are ethnic nationalism and civic nationalism. The moral value of nationalism, the relationship between nationalism and patriotism, and the compatibility of nationalism and cosmopolitanism are all subjects of philosophical debate. Nationalism can be combined with diverse political goals and ideologies, such as conservatism (national conservatism and right-wing populism) or socialism (left-wing nationalism). Nationalism is seen as positive or negative depending on its ideology and outcomes. Nationalism has been a feature of movements for freedom and justice, has been associated with cultural revivals, and encourages pride in national achievements. It has also been used to legitimize racial, ethnic, and religious divisions, suppress or attack minorities, undermine human rights and democratic traditions, and start wars, being frequently cited as a cause of both world wars.

A political party is an organization that coordinates candidates to compete in elections and participate in governance. It is common for the members of a party to hold similar ideas about politics, and parties may promote specific ideological or policy goals. Political parties have become a major part of the politics of almost every country, as modern party organizations developed and spread around the world over the last few centuries. Although some countries have no political parties, it is extremely rare. Most countries have several parties while others only have one. Parties are important in the politics of autocracies as well as democracies, though usually democracies have more political parties than autocracies. Autocracies often have a single party that governs the country, and some political scientists consider competition between two or more parties to be an essential part of democracy. Parties can develop from existing divisions in society, like the divisions between lower and upper classes, and they streamline the process of making political decisions by encouraging their members to cooperate. Political parties usually include a party leader, who has primary responsibility for the activities of the party; party executives, who may select the leader and who perform administrative and organizational tasks; and party members, who may volunteer to help the party, donate money to it, and vote for its candidates. There are many different ways in which political parties can be structured and interact with the electorate. The contributions that citizens give to political parties are often regulated by law, and parties will sometimes govern in a way that favours the people who donate time and money to them. In some cases, a political party tightly cooperates with affiliated or subordinate organizations of a different type, such as a trade union, a youth organization, or a party militia (armed wing). Many political parties are motivated by ideological goals. It is common for democratic elections to feature liberal, conservative, and socialist parties; other common ideologies of very large political parties include communism, populism, nationalism, and Islamism. Political parties in different countries will often adopt similar colours and symbols to identify themselves with a particular ideology. However, many political parties have no ideological affiliation and may instead be primarily engaged in patronage, clientelism, the advancement of a specific political entrepreneur, or be a "big tent", in that they wish to attract voters who have a variety of positions on issues.

A parliament is a type of legislature, or law-making body, of a state. Generally, a parliament has three functions: representing the electorate, making laws, and overseeing the executive government via hearings and inquiries. Its role is similar to that of a senate, synod or congress; a parliament is the institutional form of parliamentary systems based on the fusion of powers. The term parliament is commonly used in countries that are current or former monarchies. Some contexts restrict the use of the word to parliamentary systems, although it is also used to describe the legislature in some presidential systems (e.g., the Parliament of Ghana), even where it is not in the official name. A parliament is typically made up of elected members, who are legislators. Historically, parliaments included various kinds of deliberative, consultative, and judicial assemblies. Parliamentary gatherings in the Middle Ages began to establish that monarchs were subject to law and first summoned representatives of common people, notably the Cortes of León in 1188, and an English parliament in 1265, which developed into an enduring House of Commons. During the early modern period, the Glorious Revolution of 1688 in Britain established the primacy of parliamentary sovereignty, through which the rule of law could be enforced. Many other modern concepts of parliamentary government developed in the Kingdom of Great Britain (1707–1800) and were later exported to other countries around the world. The revolutions of 1848 in Europe largely failed to strengthen parliaments in most European countries, as conservative forces regained control and reversed changes, but they made a return to the pre-1848 status quo impossible, leading to gradual, long-term parliamentary development across much of Europe. Expansion of suffrage in the 19th and 20th centuries led to many parliaments around the world becoming democratically elected.

Geopolitics (from Ancient Greek γῆ gê 'earth, land' and πολιτική politikḗ 'politics') is the study of the effects of Earth's geography on politics and international relations. Geopolitics usually refers to countries and relations between them. According to multiple researchers, the term is currently being used to describe a broad spectrum of concepts, in a general sense used as "a synonym for international political relations", but more specifically "to imply the global structure of such relations"; this usage builds on an "early-twentieth-century term for a pseudoscience of political geography" and other pseudoscientific theories of historical and geographic determinism. At the level of international relations, geopolitics is a method of studying foreign policy to understand, explain, and predict international political behavior through geographical variables. These include area studies, climate, topography, demography, natural resources, and applied science of the region being evaluated. Geopolitics focuses on political power linked to geographic space, in particular, territorial waters, land territory and wealth of natural resources, in correlation with diplomatic history, in particular the context of a larger power relative to its neighboring states of smaller or similar power. Some scholars have argued that geopolitics should serve as "an aid to statecraft." Topics of geopolitics include relations between the interests of international political actors focused within an area, a space, or a geographical element, relations that create a geopolitical system. Critical geopolitics deconstructs classical geopolitical theories, by showing their political or ideological functions for great powers. There are some works that discuss the geopolitics of renewable energy. The relationship between geopolitics and geoeconomics is often analyzed by two main schools of thought: the strategic school and the political-economic school. The Austro-Hungarian historian Emil Reich (1854–1910) is considered to be the first to have coined the term in English as early as 1902 and later published in England in 1904 in his book Foundations of Modern Europe.

The Cold War was a period of international geopolitical rivalry between the United States (US) and the Soviet Union (USSR) and their respective allies, the capitalist Western Bloc and communist Eastern Bloc. It began in the aftermath of the Second World War and ended with the dissolution of the Soviet Union in 1991. The term cold war is used because there was no direct fighting between the two superpowers, though each supported opposing sides in regional conflicts known as proxy wars. In addition to the struggle for ideological and economic influence and an arms race in both conventional and nuclear weapons, the Cold War was expressed through technological rivalries such as the Space Race, espionage, propaganda campaigns, embargoes, and sports diplomacy. After the end of the Second World War in 1945, during which the US and USSR had been allies, the USSR installed satellite governments in its occupied territories in Eastern Europe and North Korea by 1949, resulting in the political division of Europe (and Germany) by an "Iron Curtain". The USSR tested its first nuclear weapon in 1949, four years after their use by the US on Hiroshima and Nagasaki, and allied with the People's Republic of China, founded in 1949. The US declared the Truman Doctrine of "containment" of communism in 1947, launched the Marshall Plan in 1948 to assist Western Europe's economic recovery, and founded the NATO military alliance in 1949 (matched by the Soviet-led Warsaw Pact in 1955). The Berlin Blockade of 1948 to 1949 was an early confrontation, as was the Korean War of 1950 to 1953, which ended in a stalemate. US involvement in regime change during the Cold War included support for First World anti-communist and right-wing dictatorships and uprisings, while Soviet involvement included the funding of Second World left-wing parties, wars of independence, and dictatorships. As nearly all the colonial states underwent decolonization, many became Third World battlefields of the Cold War. Both powers used economic aid in an attempt to win the loyalty of non-aligned countries. The Cuban Revolution of 1959 installed the first communist regime in the Western Hemisphere, and in 1962, the Cuban Missile Crisis began after deployments of US missiles in Europe and Soviet missiles in Cuba; it is widely considered the closest the Cold War came to escalating into nuclear war. Another major proxy conflict was the Vietnam War of 1955 to 1975, which ended in defeat for the US. The USSR solidified its domination of Eastern Europe with its crushing of the Hungarian Revolution in 1956 and the Warsaw Pact invasion of Czechoslovakia in 1968. Relations between the USSR and China broke down by 1961, with the Sino-Soviet split bringing the two states to the brink of war amid a border conflict in 1969. In 1972, the US initiated diplomatic contacts with China and the US and USSR signed a series of treaties limiting their nuclear arsenals during a period known as détente. In 1979, the toppling of US-allied governments in Iran and Nicaragua and the outbreak of the Soviet–Afghan War again raised tensions. In 1985, Mikhail Gorbachev became leader of the USSR and expanded political freedoms, which contributed to the revolutions of 1989 in the Eastern Bloc and the collapse of the USSR in 1991, ending the Cold War.

Communism (from Latin communis 'common, universal') is a political and economic ideology whose goal is the creation of a communist society, a socioeconomic order centered on common ownership of the means of production, distribution, and exchange that allocates products in society based on need. A communist society entails the absence of private property and social classes, and ultimately money and the state. Communism is a part of the broader socialist movement. Communists often seek a voluntary state of self-governance but disagree on the means to this end. This reflects a distinction between a libertarian socialist approach of communization, revolutionary spontaneity, and workers' self-management, and an authoritarian socialist, vanguardist, or party-driven approach to establish a socialist state, which is expected to wither away. There are many variants of communism, such as anarchist communism, Marxist schools of thought (including Leninism and its offshoots), and religious communism. These ideologies share the analysis that the current order of society stems from the capitalist economic system and mode of production; they believe that there are two major social classes under capitalism, that the relationship between them is exploitative, and that it can only be resolved through social revolution. The two classes under capitalism are the proletariat (working class), who make up most of the population and sell their labor power to survive, and the bourgeoisie (owning class), a minority that derives profit from employing the proletariat through private ownership of the means of production. Some variants additionally emphasize feudal classes, such as the peasantry and feudal lords, or other classes. According to this, a communist revolution would put the working class in power, and establish common ownership of property, the primary element in the transformation of society towards a socialist mode of production. Communism in its modern form grew out of the socialist movement in 19th-century Europe that argued capitalism caused the misery of urban factory workers. In 1848, Karl Marx and Friedrich Engels offered a new definition of communism in The Communist Manifesto. In the 20th century, Communist governments espousing Marxism–Leninism came to power, first in the Soviet Union with the 1917 Russian Revolution, then in Eastern Europe, Asia, and other regions after World War II. By the 1920s, communism had become one of the two dominant types of socialism in the world, the other being social democracy. For much of the 20th century, more than one-third of the world's population lived under Communist governments. These were characterized by one-party rule, rejection of private property and capitalism, state control of economic activity and mass media, restrictions on freedom of religion, and suppression of opposition. With the dissolution of the Soviet Union in 1991, many governments abolished Communist rule. Only a few nominally Communist governments remain, such as China, Cuba, Laos, North Korea, and Vietnam. Except for North Korea, these have allowed more economic competition while maintaining one-party rule. Communism's decline has been attributed to economic inefficiency and to authoritarianism and bureaucracy within Communist governments. Although the emergence of the Soviet Union as the first state based on Marxism–Leninism led to socialism becoming widely associated with the Soviet economic model, several scholars argue that in practice this model functioned as a form of state capitalism. Public memory of 20th-century Marxist-Leninist states has been described as a battleground between anti-communism and anti anti-communism. Authors have written about mass killings under communist regimes and mortality rates, which remain controversial, polarized, and debated topics in academia, historiography, and politics when discussing communism and the legacy of Marxist-Leninist states. From the 1990s, many Communist parties adopted democratic principles and came to share power with others in government, such as the CPN UML and the Nepal Communist Party, which support People's Multiparty Democracy in Nepal.

Liberalism is a political and moral philosophy based on the rights of the individual, liberty, consent of the governed, political equality, right to private property, and equality before the law. Different liberals espouse various and sometimes conflicting views depending on their understanding of these principles but generally support liberal democracy, private property, market economies, individual rights (including civil rights and human rights), secularism, rule of law, economic and political freedom, freedom of speech, freedom of the press, freedom of assembly, and freedom of religion. Liberalism is frequently cited as the dominant ideology of modern history. Liberalism became a distinct movement in the Age of Enlightenment, gaining popularity among Western philosophers and economists. Liberalism sought to replace the norms of hereditary privilege, state religion, absolute monarchy, the divine right of kings, and traditional conservatism with representative democracy, rule of law, and equality under the law. Liberals also ended mercantilist policies, royal monopolies, and other trade barriers, instead promoting free trade and marketization. The philosopher John Locke is often credited with founding liberalism as a distinct tradition based on the social contract, arguing that each man has a natural right to life, liberty and property, and governments must not violate these rights. While the British liberal tradition emphasized expanding democracy, French liberalism emphasized rejecting authoritarianism. Leaders in the British Glorious Revolution of 1688, the American Revolution of 1776, and the French Revolution of 1789 used liberal philosophy to justify the armed overthrow of royal sovereignty. The 19th century saw liberal governments established in Europe and South America, and it was well-established alongside republicanism in the United States. In Victorian Britain, it was used to critique the political establishment, appealing to science and reason on behalf of the people. During the 19th and early 20th centuries, liberalism in the Ottoman Empire and the Middle East influenced periods of reform, such as the Tanzimat and Al-Nahda, and the rise of constitutionalism, nationalism, and secularism. These changes, along with other factors, helped to create a sense of crisis within Islam, which continues to this day, leading to Islamic revivalism. Before 1920, the main ideological opponents of liberalism were communism, conservatism, and socialism; liberalism then faced major ideological challenges from fascism and Marxism–Leninism. During the 20th century, liberal ideas spread further, especially in Western Europe, as liberal democracies won both world wars and the Cold War. Liberals sought and established a constitutional order that prized important individual freedoms, such as freedom of speech and freedom of association; an independent judiciary and public trial by jury; and the abolition of aristocratic privileges. Later waves of modern liberal thought and struggle were strongly influenced by the need to expand civil rights. Liberals have advocated gender and racial equality in their drive to promote civil rights, and global civil rights movements in the 20th century achieved several objectives towards both goals. Other goals often accepted by liberals include universal suffrage and universal access to education. In Europe and North America, the establishment of social liberalism (often called simply liberalism in the United States) became a key component in expanding the welfare state. 21st-century liberal parties continue to wield power and influence throughout the world. The fundamental elements of contemporary society have liberal roots. The early waves of liberalism popularised economic individualism while expanding constitutional government and parliamentary authority.

Diplomacy is the communication by representatives of state, intergovernmental, or non-governmental institutions intended to influence events in the international system. Diplomacy is the main instrument of foreign policy which represents the broader goals and strategies that guide a state's interactions with the rest of the world. International treaties, agreements, alliances, and other manifestations of international relations are usually the result of diplomatic negotiations and processes. Diplomats may also help shape a state by advising government officials. Modern diplomatic methods, practices, and principles originated largely from 17th-century European customs. Beginning in the early 20th century, diplomacy became professionalized; the 1961 Vienna Convention on Diplomatic Relations, ratified by most of the world's sovereign states, provides a framework for diplomatic procedures, methods, and conduct. Most diplomacy is now conducted by accredited officials, such as envoys and ambassadors, through a dedicated foreign affairs office. Diplomats operate through diplomatic missions, most commonly consulates and embassies, and rely on a number of support staff; the term diplomat is thus sometimes applied broadly to diplomatic and consular personnel and foreign ministry officials.

Federalism is a mode of government that combines a general level of government (a central or federal government) with a regional level of sub-unit governments (e.g., counties, provinces, states, cantons, territories, etc.), while dividing the powers of governing between the two levels of governments. Johannes Althusius (1563–1638) is considered the father of modern federalism, along with Montesquieu. By 1748, in his treatise The Spirit of Law, Montesquieu (1689–1755) observed various examples of federalist governments: in corporate societies, in the polis bringing villages together, and in cities themselves forming confederations. In the modern era, federalism was first adopted by a union of the states of the Old Swiss Confederacy as of the mid-14th century. Federalism differs from confederalism, where the central government is created subordinate to the regional states—and is notable for its regional separation of governing powers (e.g., in the United States, the Articles of Confederation as the general level of government of the original Thirteen Colonies). Federalism also differs from the unitary state, where the regional level is subordinate to the central government, even after a devolution of powers (e.g., the United Kingdom). Examples of federalism today include: Argentina, Australia, Brazil, Canada, Ethiopia, Germany, India, Iraq, Malaysia, Mexico, Switzerland, the United Arab Emirates, and the United States. At a multi-state level, the European Union has been characterized by some as a federation.

Oligarchy (from Ancient Greek ὀλιγαρχία (oligarkhía) 'rule by few'; from ὀλίγος (olígos) 'few' and ἄρχω (árkhō) 'to rule, command') is a form of government in which power rests with a small number of people. Leaders of such regimes are often referred to as oligarchs, and generally are characterized by having titles of nobility or high amounts of wealth.

A prime minister, also known as a chief of cabinet, chief minister, first minister, minister-president or premier, is the head of the cabinet and the leader of the ministers in the executive branch of government, often in a parliamentary or semi-presidential system. A prime minister is not the head of state, but rather the head of government, serving as the chief of the executive under either a monarch or a president in a republican form of government. In parliamentary systems of government (be they constitutional monarchies or parliamentary republics), the Prime Minister (or occasionally a similar post with a different title, such as the Chancellor of Germany) is the most powerful politician and the functional leader of the state, by virtue of commanding the confidence of the legislature. The head of state is typically a ceremonial officer, though they may exercise reserve powers to check the Prime Minister in unusual situations. Under some presidential systems, such as South Korea and Peru, the prime minister is the leader or the most senior member of the cabinet, but not the head of government. As such, in South Korea, the prime minister is equivalent to that of a vice president which is the second in-command and assumes the presidency in the absence of the president. In many systems, the prime minister selects and may dismiss other members of the cabinet, and allocates posts to members within the government. In most systems, the prime minister is the presiding member and chairman of the cabinet. In a minority of systems, notably in semi-presidential systems, a prime minister is the official appointed to manage the civil service and execute the directives of the head of state. Today, the prime minister is often, but not always, a member of the legislature or its lower house, and is expected with other ministers to ensure the passage of bills through the legislature. In some monarchies the monarch may also exercise executive powers (known as the royal prerogative) without the approval of parliament. As well as being head of government, being prime minister may require holding other roles or posts—the prime minister of the United Kingdom, for example, is also First Lord of the Treasury and Minister for the Civil Service. In some cases, prime ministers may choose to hold additional ministerial posts (e.g. when the portfolio is critical to that government's mandate): during the Second World War Winston Churchill was also Minister of Defence (although there was then no Ministry of Defence). Another example is the Thirty-fourth government of Israel (2015–2019), when Benjamin Netanyahu at one point served as the prime minister and minister of Communications, Foreign Affairs, Regional Cooperation, Economy, Defense and Interior.

The president of the United States (POTUS) is the head of state and head of government of the United States. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces. The power of the presidency has grown since the first president, George Washington, took office in 1789. While presidential power has ebbed and flowed over time, the presidency has played an increasing role in American political life since the beginning of the 20th century, carrying over into the 21st century with some expansions during the presidencies of Franklin D. Roosevelt and George W. Bush. In the 21st century, the president is one of the world's most powerful political figures and the leader of a superpower. As the leader of the nation with the largest economy by nominal GDP, the president possesses significant domestic and international hard and soft power. For much of the 20th century, especially during the Cold War, the U.S. president was often called "the leader of the free world". Article II of the Constitution establishes the executive branch of the federal government and vests executive power in the president. The power includes the execution and enforcement of federal law and the responsibility to appoint federal executive, diplomatic, regulatory, and judicial officers. Based on constitutional provisions empowering the president to appoint and receive ambassadors and conclude treaties with foreign powers, and on subsequent laws enacted by Congress, the modern presidency has primary responsibility for conducting U.S. foreign policy. The role includes responsibility for directing the world's most expensive military, which has the second-largest nuclear arsenal. The president also plays a leading role in federal legislation and domestic policymaking. As part of the system of separation of powers, Article I, Section 7 of the Constitution gives the president the power to sign or veto federal legislation. Since modern presidents are typically viewed as leaders of their political parties, major policymaking is significantly shaped by the outcome of presidential elections, with presidents taking an active role in promoting their policy priorities to members of Congress who are often electorally dependent on the president. Over time, presidents have also made increasing use of executive orders, agency regulations, and judicial appointments to shape domestic policy. The president is elected through the Electoral College to a four-year term, along with the vice president. Under the Twenty-second Amendment, ratified in 1951, no person who has been elected to two presidential terms may be elected to a third. In addition, nine vice presidents have become president by virtue of a president's intra-term death or resignation. In all, 45 individuals have served, or are serving, 47 presidencies as of the current 60th four-year term. Donald Trump is the 47th and current president since January 20, 2025.

Authoritarianism is a political system characterized by the rejection of political plurality, the use of strong central power to preserve the political status quo, and reductions in democracy, separation of powers, civil liberties, and the rule of law. Authoritarian regimes may be either autocratic or oligarchic and may be based upon the rule of a party, the military, or the concentration of power in a single person. States that have a blurred boundary between democracy and authoritarianism have sometimes been characterized as "hybrid democracies", "hybrid regimes" or "competitive authoritarian" states. The political scientist Juan Linz, in an influential 1964 work, An Authoritarian Regime: Spain, defined authoritarianism as possessing four qualities: Limited political pluralism, which is achieved with constraints on the legislature, political parties and interest groups. Political legitimacy based on appeals to emotion and identification of the regime as a necessary evil to combat "easily recognizable societal problems, such as underdevelopment or insurgency." Minimal political mobilization, and suppression of anti-regime activities. Ill-defined executive powers, often vague and shifting, used to extend the power of the executive. Minimally defined, an authoritarian government lacks free and competitive direct elections to legislatures, free and competitive direct or indirect elections for executives, or both. Broadly defined, authoritarian states include countries that lack human rights such as freedom of religion, or countries in which the government and the opposition do not alternate in power at least once following free elections. Authoritarian states might contain nominally democratic institutions such as political parties, legislatures and elections which are managed to entrench authoritarian rule and can feature fraudulent, non-competitive elections. Since 1946, the share of authoritarian states in the international political system increased until the mid-1970s but declined from then until 2000. Prior to 2000, dictatorships typically began with a coup and replaced a pre-existing authoritarian regime. Since 2000, dictatorships are most likely to begin through democratic backsliding whereby a democratically elected leader established an authoritarian regime.