The US supported South Vietnam because its covernment was anti-communist.
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The United States supported South Vietnam because the North Vietnamese were communists being supported by Communist China and the US didn't like that. The South Vietnamese agreed with democracy (there was a civil war in the country before France and America got involved).
Its government was anti-Communist.----- apex
The US/Allies fought Communist North Vietnam to prevent it from conquering South Vietnam. On April 30, 1975 North Vietnamese Army (NVA) Tanks crashed through the gates of SOUTH Vietnam's Capital, capturing the city, and conquering the nation of SOUTH Vietnam; ending the war.
Vietnam was an off shoot of the Cold War. The US didn't want the Vietnamese to become communist. So they provided arms, training and later troops to defend South Vietnam against the Chinese supported North Vietnam.
Vietnam war
The United States did get involved in the Vietnam war because of communism in Vietnam.
The United States
The longest war the United States ever entered was the Vietnam War.
The United States has had a continuous military presence in South Vietnam since the war in 1950.