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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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
1972 in the Vietnam War terms of the draft peace agreement and accused the United States of negotiating in bad faith. In Washington, despite the opposition of South Vietnam to the draft peace agreement and the charges by North Vietnam that the U.S. was negotiating in bad faith, National Security Adviser Kissinger declared "peace was at hand" in Vietnam. President Nixon of the United States won reelection with 60.7 percent of the vote. In an attempt to overcome President Thieu's objection to the draft peace agreement, President Nixon wrote him that "You have my absolute assurance that if Hanoi fails to abide by the terms