<Li> Vietnam War Crimes Working Group </Li> <P> The Vietnam War (Vietnamese: Chiến tranh Việt Nam), also known as the Second Indochina War, and in Vietnam as the Resistance War Against America (Vietnamese: Kháng chiến chống Mỹ) or simply the American War, was a conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975 . It was the second of the Indochina Wars and was officially fought between North Vietnam and the government of South Vietnam . The North Vietnamese army was supported by the Soviet Union, China and other communist allies and the South Vietnamese army was supported by the United States, South Korea, Australia, Thailand and other anti-communist allies . The war is considered a Cold War - era proxy war by some US perspectives . The majority of Americans believe the war was unjustified . The war would last roughly 19 years and would also form the Laotian Civil War as well as the Cambodian Civil War, which also saw all three countries become communist regimes in 1975 . </P> <P> There are several competing views on the conflict, with some on the North Vietnam ese and National Liberation Front side viewing the struggle against US forces as a colonial war and a continuation of the First Indochina War against forces from France and later on the United States especially the light of the failed Geneva Conference calls for elections . Other interpretations of the North Vietnamese side include viewing it as a civil war especially in the early and later phases following the U.S interlude between 1965 and 1970 as well as a war of liberation . The perspective of some Provisional Revolutionary Government of the Republic of South Vietnam, the successor to the Viet Cong were motivated in part by significant social changes in the post-WW2 Vietnam, and had initially saw it as a revolutionary war supported by Hanoi The pro-government side in South Vietnam viewed it as a civil war, a defensive war against communism or were motivated to fight to defend their homes and families . The U.S. government viewed its involvement in the war as a way to prevent a communist takeover of South Vietnam . This was part of the domino theory of a wider containment policy, with the stated aim of stopping the spread of communism . </P> <P> Beginning in 1950, American military advisors arrived in what was then French Indochina . Most of the funding for the French war effort was provided by the U.S. The Viet Cong, also known as Front national de libération du Sud - Viêt Nam or FNL (the National Liberation Front), a South Vietnamese communist common front aided by the North, fought a guerrilla war against anti-communist forces in the region, while the People's Army of Vietnam, also known as the North Vietnamese Army (NVA), engaged in more conventional warfare, and had launched armed struggles from 1959 onward . U.S. involvement escalated in 1960 under Kennedy, with troop levels gradually surging under the MAAG program, from just under a thousand in 1959 to 16,000 in 1963 . </P>

Why did the united states send troops to fight in vietnam