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Bay of Pigs Invasion: A failed 1961 CIA-sponsored invasion of southwestern Cuba by approximately 1,400 U.S.-trained Cuban exiles; its quick defeat bolstered Castro's domestic standing, prompted his public declaration of the revolution's socialist character, and accelerated military alignment with the Soviet Union.

Castro and Communism: Castro's pragmatic evolution from an independent nationalist to a communist leader, driven by the need for experienced administrators from the PSP, ideological influence from his brother Raúl, escalating conflict with the United States over nationalizations, and the aftermath of the Bay of Pigs invasion.

Integrated Revolutionary Organizations (ORI): A 1961 political coalition merging the 26th of July Movement, Directorio Revolucionario, and the PSP to unify leadership; it later became the Communist Party of Cuba (PCC) in 1965 after Castro ousted PSP official Aníbal Escalante for sectarian power grabs.

INRA (National Institute of Agrarian Reform): An administrative body formed in May 1959 under figures like Antonio Núñez Jiménez that answered directly to Castro, tasked with enforcing land redistribution, establishing state farms, and centralizing control over the Cuban economy.

United Fruit Company: A prominent U.S. corporation with extensive sugar and infrastructure holdings in Cuba symbolizing foreign economic dominance; its properties were expropriated during the 1960 agrarian nationalizations, severely straining U.S.-Cuba relations.

First Agrarian Reform Law: A May 1959 decree capping private landownership at approximately 1,000 acres, expropriating large foreign and domestic estates with government bonds, and redistributing acreage to peasants and state cooperatives via INRA.

The Escambray Rebellion: A 1960–1965 armed rural insurgency in the Escambray Mountains fought by Batista loyalists and disillusioned former revolutionaries; initially supported by the CIA, it was completely suppressed by Castro's armed forces by 1965.

Huber Matos: A 26th of July Movement commander in Camagüey who resigned in October 1959 to protest growing communist influence; Castro treated his dissent as treason, sentencing him to 20 years in prison to consolidate regime loyalty.

U.S. Cold War Interventions in Latin America: Covert and diplomatic actions by the U.S. to eliminate communist influences and safeguard commercial interests—including the 1954 CIA coup in Guatemala and shifting operations around Rafael Trujillo in the Dominican Republic—which reinforced Castro's distrust of American intentions.

U.S. Embargo of Cuba: Comprehensive trade restrictions initiated by President Eisenhower in 1960 and expanded into a full commercial embargo by President Kennedy in February 1962 to economically weaken Castro's government, which pushed Cuba into Soviet economic dependency.

Cuban-Soviet Economic Agreement: A landmark February 1960 bilateral agreement in which the USSR agreed to purchase one million tons of Cuban sugar annually for five years, supply crude oil, and extend $100 million in credit for industrial machinery.

Nationalization of Oil Refineries: The June–July 1960 seizure of Esso, Texaco, and Shell refineries after they refused to process imported Soviet crude oil, prompting U.S. sugar quota cancellations and triggering extensive Cuban counter-nationalizations of American assets.

Cuban Missile Crisis: A 13-day nuclear standoff in October 1962 caused by the secret installation of Soviet ballistic missiles in Cuba; resolved when Kennedy pledged not to invade Cuba (and secretly withdrew missiles from Turkey and Italy) in exchange for Khrushchev removing the Cuban missiles, leaving Castro frustrated by his exclusion from negotiations.