The Vietnam War grew out of the American commitment to the containment of communism during the Cold War. For approximately fifteen years, the Democratic Republic of Vietnam (North Vietnam) fought against an American-supported Republic of Vietnam (South Vietnam). The war for the U.S. ended in 1973 with the withdrawal of American combat troops, and two years later, South Vietnamese forces surrendered to the North. With the unification of Vietnam under the Communist government of the North, the U.S. had officially failed to achieve its objectives.