Juan Perón in the context of Revolución Libertadora

The National Reorganization Process (Spanish: Proceso de Reorganización Nacional, PRN; often simply el Proceso, "the Process") was the military dictatorship that ruled Argentina from the coup d'état of March 24, 1976, until the unconditional transfer of power to a government elected by the citizens on December 10, 1983. In Argentina it is often known simply as the última junta militar ("last military junta"), última dictadura militar ("last military dictatorship"), última dictadura cívico-militar ("last civil–military dictatorship"), or última dictadura cívico-eclesial-militar ("last civil–clerical-military dictatorship") — because there have been several in the country's history and no others like it since it ended. It took the form of a bureaucratic-authoritarian state and was characterized by establishing a systematic plan of state terrorism, which included murders, kidnappings, torture, forced disappearances, and the kidnapping of babies (and concealment of their identity). It is considered "the bloodiest dictatorship in Argentine history".

The Argentine Armed Forces seized political power during the March 1976 coup against the presidency of Isabel Perón, the successor and widow of former President Juan Perón, at a time of growing economic and political instability. Congress was suspended, political parties were banned, civil rights were limited, and free market and deregulation policies were introduced. The President of Argentina and his ministers were appointed from military personnel while leftists and Peronists were persecuted. The junta launched the Dirty War, a campaign of state terrorism against opponents involving torture, extrajudicial murder and systematic forced disappearances. Public opposition due to civil rights abuses and inability to solve the worsening economic crisis in Argentina caused the junta to invade the Falkland Islands in April 1982. After starting and then losing the Falklands War against the United Kingdom in June, the junta began to collapse and finally relinquished power in 1983 with the election of President Raúl Alfonsín.

The Argentine Anticommunist Alliance (Spanish: Alianza Anticomunista Argentina, usually known as Triple A or AAA) was an Argentine fascist political paramilitary group operated by a sector of the Federal Police and the Argentine Armed Forces, linked with the anticommunist lodge Propaganda Due, that killed artists, priests, intellectuals, leftist politicians, students, historians and union members, as well as issuing threats and carrying out extrajudicial killings and forced disappearances during the presidencies of Juan Perón and Isabel Perón between 1973 and 1976. The group was responsible for the disappearance and death of between 700 and 1100 people.

The Triple A was secretly led by José López Rega, Minister of Social Welfare and personal secretary of Juan Perón. Rodolfo Almirón, arrested in Spain in 2006, was alleged to be his chief operating officer of the group, and was officially head of López Rega's and Isabel Perón's personal security. He was extradited from Spain in 2006 and prosecuted; he died in jail in June 2009. SIDE agent Anibal Gordon was another important member of the Triple A, although he always denied it. He was tried in Argentina in 1985 after the restoration of democracy and convicted in October 1986. Gordon died in prison of lung cancer the next year.

Peronism, also known as justicialism, is an Argentine ideology and political movement with a populist tendency, based on the ideas, doctrine, and legacy of Juan Perón (1895–1974). It has been an influential movement in 20th- and 21st-century Argentine politics. Since 1946, Peronists have won 10 out of the 14 presidential elections in which they have been allowed to run. Peronism is defined through its three flags: "social justice" (the fight against social and economic inequalities), "economic independence" (an economy that does not depend on other countries, by developing its national industry), and "political sovereignty" (the non-interference of foreign powers in domestic affairs).

Peronism, as an ideology, is described as a social form of nationalism, as it promotes a sense of national pride among Argentines. However, it promotes an inclusive form of nationalism that embraces all ethnicities and races as integral parts of the nation, distinguishing it from racial or chauvinistic ethno-nationalism that prioritizes a single ethnic group. This is due to the ethnically heterogeneous background of Argentina, which is a result of the mixing between indigenous peoples, Criollos, various immigrant groups, and their descendants. Likewise, Peronism is generally considered populist, as it relies on the figure of a leader (originally embodied by Perón) to lead the masses. Consequently, it adopted a third position in the context of the Cold War, as expressed in the phrase: "we are neither Yankees nor Marxists."

Isabel Martínez de Perón (Spanish pronunciation: [isaˈβel maɾˈtines ðe peˈɾon] , born María Estela Martínez Cartas; 4 February 1931) is an Argentine politician who served as the 41st president of Argentina from 1974 to 1976. She was one of the first female republican heads of state in the world, and the first woman to serve as president of a country. Perón was the third wife of President Juan Perón. During her husband's third term as president from 1973 to 1974, she served as both the 29th vice president and first lady of Argentina. From 1974 until her resignation in 1985, she was also the second President of the Justicialist Party. Isabel Perón's politics exemplify right-wing Peronism and Orthodox Peronism. Ideologically, she was considered close to corporate neo-fascism.

Following her husband's death in office in 1974, she served as President for almost two years before the military took over the government with the 1976 coup. Perón was then placed under house arrest for five years before she was exiled to Spain in 1981. After democracy was restored in Argentina in 1983, she was a guest of honor at President Raúl Alfonsín's inauguration. For several years, she was a nominal head of Juan Perón's Justicialist Party and played a constructive role in reconciliation discussion, but has never again played any important political role.

The Justicialist Party (Spanish: Partido Justicialista [paɾˈtiðo xustisjaˈlista], PJ), also known as the Peronist Party (Spanish: Partido Peronista), is a major political party in Argentina, and the largest branch within Peronism. Following the 2023 presidential election, it has been the largest party in the opposition against President Javier Milei.

Founded by Juan Perón and his wife, First Lady Eva Perón, the party followed a left-wing agenda based on his policies. It is overall the largest party in Congress. Historically, the party's factual position was undermined by divisions that emerged in the 1990s and lasted until 2020; the PJ was rocked by a conflict between two Peronist tendencies, Kirchnerism, the main, left-wing populist faction, and Federal Peronism, which was located on the centre and centre-right of the political spectrum. The division ended with the failure of Federal Peronism to challenge the dominating Kirchnerist faction in 2019. This was completed by Cristina Kirchner, the leader of Kirchnerism, being elected the leader of the party, and the creation of a separate dissident party — the Federal Consensus. Today, the party adheres to an ideology based on economic intervention, welfare-state policies, and economic independence from wealthier countries; it is located on the centre-left and left wing of the political spectrum.