The War.
The Vietnam War was a long, costly armed conflict that pitted the communist regime of North Vietnam and its southern allies, known as the VietCong, against South Vietnam and its principal ally, the United States. The war, increasingly unpopular at home, ended with the withdrawal of U.S. forces in 1973 and the unification of Vietnam under Communist control two years later. More than 3 million people, including 58,000 Americans, were killed in the conflict.