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They wanted to 'contain' communism to stop it spreading. They believed in the domino theory, that if Vietnam fell to communism, then so would the whole of Southeast Asia. The presidents who were involved in Vietnam were all concerned with looking tough against communism, and wanted America to appear like a strong nation. The 'quagmire theory' helps explain why successive presidents became increasingly involved; this is the belief that the US got slowly stuck in Vietnam, and it became harder and harder to withdraw commitment.

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14y ago

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