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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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
Peace of Nicias Peace of Nicias The Peace of Nicias, also known as the Fifty-Year Peace, was a peace treaty signed between the Greek city-states of Athens and Sparta in March 421 BC, ending the first half of the Peloponnesian War. In 425 BC, the Spartans had lost the battles of Pylos and Sphacteria, a severe defeat resulting in the Athenians' holding 292 prisoners. At least 120 were Spartiates. They had recovered by 424 BC, when the Spartan general Brasidas captured Amphipolis. In the same year, the Athenians suffered a major defeat in Boeotia at the Battle of Delium, and in 422 BC