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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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
People's Peace Treaty People's Peace Treaty The People's Peace Treaty was developed in December 1970, by representatives of United States and Vietnamese student organizations. The treaty was part of a collaborative effort to end the Vietnam War by outlining a number of principles with which all sides could agree. Be it known that the American and Vietnamese peoples are not enemies. The war is carried out in the names of the people of the United States and South Vietnam but without our consent. It destroys the land and people of Vietnam. It drains America of its resources, its youth and its honor.<br> <br>