Cuban Revolution Explained: Causes, Timeline & Aftermath

1. The Cuban Revolution, Briefly

The Cuban Revolution was a six-year armed and political struggle, from 1953 to 1959, that replaced Fulgencio Batista's dictatorship with a government led by Fidel Castro's 26th of July Movement. It is the founding event of the Cuba that exists today — the source of the country's one-party political system, its state-run economy, and, indirectly, the U.S. trade embargo that followed within three years of Batista's fall.

2. What Caused the Revolution

Fulgencio Batista, a former president, seized power again in a March 1952 military coup three months before scheduled elections he was expected to lose. He suspended Cuba's 1940 constitution and ruled by decree, closing off the legal political path his opponents had been pursuing. Batista's government was also widely seen as corrupt and closely tied to U.S. business interests and organized-crime-linked casino operators in Havana, a combination that fed resentment among students, professionals, and rural workers alike. That resentment gave a small opposition movement — including a young lawyer named Fidel Castro — the political opening to organize an armed challenge to the government.

3. 1953: The Moncada Barracks Attack

On July 26, 1953, Fidel Castro led roughly 130 armed rebels in a coordinated assault on the Moncada Barracks in Santiago de Cuba, the country's second-largest military garrison, intending to seize weapons and spark a broader uprising. The attack failed within hours; many rebels were killed or captured, and several were executed after surrendering. Castro himself was captured, tried, and sentenced to 15 years in prison. At his trial he delivered a lengthy self-defense speech, later published as "History Will Absolve Me," laying out the social program his movement would pursue if it took power. Though a military failure, Moncada gave the movement its name — the 26th of July Movement — and its first national profile.

4. 1956–1958: The Sierra Maestra Campaign

Batista granted amnesty to Castro and his fellow prisoners in 1955, and Castro went into exile in Mexico, where he organized a new expedition with his brother Raúl Castro and Argentine revolutionary Ernesto "Che" Guevara. On December 2, 1956, 82 fighters landed in eastern Cuba aboard a small overloaded yacht, the Granma; a Batista ambush killed or captured most of them within days, leaving a core group of survivors — often cited as around 20 — to retreat into the Sierra Maestra mountains. From that base, the rebels rebuilt into a guerrilla force over the next two years, waging a rural insurgency while urban allies, including the Civic Resistance Movement, organized strikes and sabotage. By late 1958, rebel columns under Che Guevara and Camilo Cienfuegos had pushed into central Cuba, cutting the island in two and taking the city of Santa Clara in a final battle at year's end.

5. January 1959: Batista Falls

Facing military collapse after the loss of Santa Clara, Batista fled Cuba in the early hours of January 1, 1959, first to the Dominican Republic and eventually settling in Portugal and later Spain, where he died in 1973. Rebel forces took Santiago de Cuba that same day, and Fidel Castro led a triumphant column into Havana a week later, on January 8, 1959. A provisional government installed judge Manuel Urrutia Lleó as president, though real authority rested with Castro, who formally became prime minister in February 1959 and consolidated power over the following two years.

6. Aftermath: Reform, Nationalization & the Embargo

The new government moved quickly. Its May 1959 Agrarian Reform Law capped landholding size and redistributed large estates, hitting both Cuban elites and American agricultural companies with Cuban land holdings. Through 1960, the government nationalized U.S.-owned oil refineries, sugar mills, and utilities without the compensation Washington demanded, prompting the United States to cut Cuba's sugar import quota and, in October 1960, impose its first major trade restrictions. Cuba responded by nationalizing all remaining U.S. business interests on the island. The United States severed diplomatic relations in January 1961, and President Kennedy imposed a near-total trade embargo effective February 7, 1962 — a policy our Cuba embargo explainer covers in full legal detail. Fidel Castro publicly declared the revolution's socialist character in 1961, and Cuba's alignment with the Soviet Union set up the Cuban Missile Crisis the following year, covered in our Missile Crisis explainer.

Sources

• Library of Congress, Federal Research Division — "Cuba: A Country Study"
• U.S. Department of State, Office of the Historian — Cuba–U.S. relations, 1958–1962
• Encyclopedia Britannica — Cuban Revolution, Moncada Barracks attack, Fulgencio Batista
• National Security Archive, George Washington University — Proclamation 3447 (1962 embargo)