The US fought in the Vietnam War to stop communism.
This was part of the domino theory of a wider containment policy , with the stated aim of stopping the spread of communism worldwide.
It is best known as the Cold War policy of the United States and its allies to prevent the spread of communism.
The Vietnam War -LRB- Chiến tranh Việt Nam -RRB- , also known as the Second Indochina War , and known in Vietnam as Resistance War Against America -LRB- Kháng chiến chống Mỹ -RRB- or simply the American War , was a war that occurred in Vietnam , Laos , and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975.
The U.S. government viewed its involvement in the war as a way to prevent a communist takeover of South Vietnam.
