As a young medical student, Guevara traveled throughout Latin America and was radically transformed by the endemic poverty and alienation he witnessed. His experiences and observations during these trips led him to conclude that the region's ingrained economic inequalities were an intrinsic result of capitalism, monopolism, neocolonialism, and imperialism, with the only remedy being world revolution.This belief prompted his involvement in Guatemala's social reforms under President Jacobo Arbenz, whose eventual CIA-assisted overthrow solidified Guevara's political ideology. Later, while living in Mexico City, he met Raúl and Fidel Castro, joined their 26th of July Movement, and sailed to Cuba aboard the yacht, Granma, with the intention of overthrowing U.S.-backed Cuban dictator Fulgencio Batista. Guevara soon rose to prominence among the insurgents, was promoted to second-in-command, and played a pivotal role in the victorious two-year guerrilla campaign that deposed the Batista regime.
Following the Cuban Revolution, Guevara performed a number of key roles in the new government. These included reviewing the appeals and firing squads for those convicted as war criminals during the revolutionary tribunals, instituting agrarian land reform as minister of industries, helping spearhead a successful nationwide literacy campaign, serving as both national bank president and instructional director for Cuba’s armed forces, and traversing the globe as a diplomat on behalf of Cuban socialism. Such positions also allowed him to play a central role in training the militia forces who repelled the Bay of Pigs Invasion] and bringing the Soviet nuclear-armed ballistic missiles to Cuba which precipitated the 1962 Cuban Missile Crisis.] Additionally, he was a prolific writer and diarist, composing a seminal manual on guerrilla warfare, along with a best-selling memoir about his youthful motorcycle journey across South America. Guevara left Cuba in 1965 to foment revolution abroad, first unsuccessfully in Congo-Kinshasa and later in Bolivia, where he was captured by CIA-assisted Bolivian forces and executed.