In 1954-1975 Vietnam War, a protracted conflict that pitted the communist government of North Vietnam and its allies in South Vietnam, known as the Viet Cong, against the government of South Vietnam and its principal ally, the United States. Called the American War in Vietnam (or, in full, the War Against the Americans to Save the Nation), the war was also part of a larger regional conflict and a manifestation of the Cold War between the United States and the Soviet Union and their respective allies.