The Brazilian military government was the authoritarian military dictatorship that ruled Brazil from April 1, 1964 to March 15, 1985. It began with the 1964 coup d'\E9tat led by the Armed Forces against the civil administration.  The coup was also supported by the United States. 

 The military dictatorship lasted for almost twenty-one years; despite initial pledges to the contrary, military governments in 1967 enacted a new, restrictive Constitution, and stifled freedom of speech and political opposition with support from the U.S. government. The regime adopted nationalism, economic development, and Anti-Communism as its guidelines. 

 The dictatorship reached the height of its popularity in the 1970s, with the so-called Brazilian Miracle, even as the regime censored all media, tortured and banished dissidents. While combating the "hard-line" and supporting a re-democratization policy, Military Regime couldn't control the chronic inflation and concurrent fall of other military dictatorships in South America. Brazilian Presidential elections of 1984 were won by opposition civilian candidates. In 1979 Figueiredo passed the Amnesty Law for political crimes committed for and against the regime. 

 Since the 1988 Constitution was passed and Brazil returned to full democracy, the military have remained under control of civilian politicians, with no role in domestic politics. Brazil's military regime provided a model for other military regimes and dictatorships around Latin America, systematizing the "Doctrine of National Security," which "justified" the military's actions as operating in the interest of National Security in a time of crisis, creating an intellectual basis upon which other military regimes relied.