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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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
Treaty of Ryswick Treaty of Ryswick The Treaty or Peace of Ryswick, also known as The Peace of Rijswijk was a series of agreements signed in the Dutch city of Rijswijk between 20 September and 30 October 1697, ending the 1689-97 Nine Years War between France and the Grand Alliance of England, Spain, the Holy Roman Empire and the Dutch Republic. The Nine Years War had been financially crippling for its participants, primarily because armies increased in size from an average of 25,000 in 1648 to over 100,000 by 1697. This was unsustainable for pre-industrial economies; military spending in this period absorbed 80%