1972 in the Vietnam War the number of air raids against North Vietnam during all of 1971. Prime Minister Lon Nol declared President of Cambodia. Unlike the former Cambodian leader, Norodom Sihanouk, Lon Nol was a U.S. ally. The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam. The Khmer Rouge bombarded with artillery Phnom Penh, the capital city of Cambodia, killing more than 100 civilians. This was the heaviest attack on Phnom Penh since the Cambodian Civil War began in 1970. The United States boycotted peace negotiations in Paris with the North Vietnamese, citing
Treaty of Peace Between Japan and India sovereignty. After the conference, on April 28, 1952, Japan regained their sovereignty with the withdrawal of most occupational forces. Treaty of Peace Between Japan and India The Treaty of Peace Between Japan and India (日本国とインドとの間の平和条約) was a peace treaty signed on June 9, 1952 restoring relations between the two nations. India, as part of the British Empire, had full diplomatic relations with Japan until end of World War II. After the war Ally Forces occupied Japan and India gained its independence on August 15, 1947. In 1951, the San Francisco Peace Conference was held with Indian Prime Minister Jawaharlal Nehru