Born to a prosperous farmer in Prek Sbauv, French Cambodia, Pol Pot was educated at some of Cambodia's most elite schools. While in Paris during the 1940s, he joined the French Communist Party. Returning to Cambodia in 1953, he involved himself in the Marxist–Leninist Khmer Việt Minh organisation and its guerrilla war against King Norodom Sihanouk's newly independent government. Following the Khmer Việt Minh's 1954 retreat into Marxist–Leninist controlled North Vietnam, Pol Pot returned to Phnom Penh, working as a teacher while remaining a central member of Cambodia's Marxist–Leninist movement. In 1959, he helped formalise the movement into the Kampuchean Labour Party, which was later renamed the Communist Party of Kampuchea (CPK). To avoid state repression, in 1962 he relocated to a jungle encampment and in 1963 became the CPK's leader. In 1968, he relaunched the war against Sihanouk's government. After Lon Nol ousted Sihanouk in a 1970 coup, Pol Pot's forces sided with the deposed leader against the new government, which was bolstered by the United States military. Aided by the Việt Cộng militia and North Vietnamese troops, Pol Pot's Khmer Rouge forces advanced and controlled all of Cambodia by 1975.