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why we went to war
The USA went to war for only one reason, Communism. The USA disagreed with Communism because they knew it would fail. The USA also was afraid of the Domino effect which is theory that says if 1 country falls to Communism the ones around it would (like tipping over 1 domino and the rest fall over). They went to aid the Capitalist South Vietnam from the Communist North Vietnam.