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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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
Australian–Thai Peace Treaty Australian–Thai Peace Treaty The Australian–Thai Peace Treaty that ended World War II between Australia and Thailand was signed in Bangkok on 3 April 1946. The full title of the peace treaty is "Final Peace Agreement Between the Government of Australia and the Government of Siam". It was one of the first expressions of Australian sovereignty and independence in foreign affairs after the Statute of Westminster came into effect in 1942. In November 1941, as concerns about war with the Japanese in the Pacific grew, the Thai minister of justice, Thamrong Navasawat, met the Australian prime minister, Robert Gordon Menzies, in