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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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
1973 in the Vietnam War agreement is violated" by North Vietnam and to continue aid to South Vietnam if Thieu cooperated." All bombing of North Vietnam by the United States was halted and would not be resumed. Thieu responded to Nixon's letter with a long list of objections to the draft peace agreement, most importantly the fact that the withdrawal of all North Vietnamese forces from South Vietnam was not required. President Nixon responded to President Thieu's objections to the draft peace agreement. He attempted to reassure Thieu on the issue of North Vietnamese soldiers in South Vietnam. He repeated that he would sign the