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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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
U.S.–Hungarian Peace Treaty (1921) U.S.–Hungarian Peace Treaty (1921) The U.S.–Hungarian Peace Treaty is a peace treaty between the United States and the Kingdom of Hungary, signed in Budapest on August 29, 1921, in the aftermath of the First World War. This separate peace treaty was required because the United States Senate refused to ratify the multilateral Treaty of Trianon. Ratifications were exchanged in Budapest on December 17, 1921, and the treaty became effective on the same day. The treaty was registered in "League of Nations Treaty Series" on May 8, 1926. During the First World War, Hungary - which formed part of the nucleus