The Cuban Revolution was an armed revolt conducted by Fidel Castro and his fellow revolutionaries of the 26th of July Movement and its allies against the military dictatorship of Cuban President Fulgencio Batista. The revolution began in July 1953, and continued sporadically until the rebels finally ousted Batista on 31 December 1958, replacing his government. 26 July 1953 is celebrated in Cuba as the Day of the Revolution. The 26th of July Movement later reformed along Marxist–Leninist lines, becoming the Communist Party of Cuba in October 1965.
The Cuban Revolution had powerful domestic and international repercussions. In particular, it transformed Cuba–United States relations, although efforts to improve diplomatic relations have gained momentum in recent years such as the Cuban thaw. In the immediate aftermath of the revolution, Castro's government began a program of nationalization, centralization of the press and political consolidation that transformed Cuba's economy and civil society. The revolution also heralded an era of Cuban medical internationalism and Cuban intervention in foreign military conflicts in Africa, Latin America, Southeast Asia, and the Middle East.