The Cuban Revolution overthrew the authoritarian regime of Fulgencio Batista in 1959 and established a communist government led by Fidel Castro. Long-term causes of the revolution included socioeconomic inequalities between the wealthy elite and poor majority, anti-American sentiment due to US influence over Cuba's economy, and political corruption under Batista. Fidel Castro and his 26th of July Movement engaged in guerilla warfare against Batista's forces from their base in the Sierra Maestra mountains. They gained popular support and eventually overthrew Batista on January 1, 1959, leading to Castro establishing a new communist government aligned with the Soviet Union.