In March 1952 former president Batista, supported by the army, seized power. Batista suspended the constitution, dissolved the congress, and instituted a provisional government, promising elections the following year. After crushing an uprising in Oriente Province led by a young lawyer named Fidel Castro on July 26, 1953, the regime seemed secure, and when the political situation had been calmed, the Batista government announced that elections would be held in the fall of 1954. Batista's opponent, Grau San Martin, withdrew from the campaign just before the election, charging that his supporters had been terrorized. Batista was thus reelected without opposition, and on his inauguration February 24, 1955, he restored constitutional rule and granted amnesty to political prisoners, including Castro. The latter chose exile in the United States and later in Mexico.
In the mid-1950s the Batista government insituted an economic development program that, together with a stabilization of the world sugar price, improved the economic and political outlook in Cuba. On December 2, 1956, however, Castro, with some 80 insurgents, invaded. The force was crushed by the army, but Castro escaped into the mountains, where he organized the 26th of July Movement, so called to commemorate the 1953 uprising. For the next year Castro's forces, using guerrilla tactics, opposed the Batista government and won considerable popular support. On March 17, 1958, Castro called for a general revolt. His forces made steady gains through the remainder of the year, and on January 1, 1959, Batista resigned and fled the country. A provisional government was established. Castro, although he initially renounced office, became premier in mid-February. In the early weeks of the regime military tribunals tried many former Batista associates, and some 550 were executed.