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 The U.S. 101st Airborne Division left South Vietnam, the last U.S. ground combat division to be withdrawn from South Vietnam.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
Thirty Years' Peace Thirty Years' Peace The Thirty Years' Peace was a treaty, signed between the ancient Greek city-states Athens and Sparta, in the year 446/445 BCE. The treaty brought an end to the conflict commonly known as the First Peloponnesian War, which had been raging since c. 460 BCE. The purpose of the treaty was to prevent another outbreak of war. Ultimately, the peace treaty failed in achieving its goal, with the outbreak of the Second Peloponnesian War in 431 BCE. Athens was forced to give up all of her possessions in the Peloponnese which included the Megarian ports of Nisaea and