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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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 and not to interfere in the internal affairs of these two countries.<br> 9. Upon these points of agreement, we pledge to end the war and resolve all other questions in the spirit of self-determination and mutual respect for the independence and political freedom of the people of Vietnam and the United States.<br> <br> By ratifying this agreement, we pledge to take whatever actions are appropriate to implement the terms of this Joint Treaty of Peace, and to insure its acceptance by the government of the United States.<br> <br> South Vietnam National Student Union <br> South Vietnam Liberation Student Union <br>