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Answer:How--The Presidents of the United States (Eisenhower, Kennedy, Nixon, and Johnson) continually sent troops and supplies to South Vietnam to fight and aid the South Vietnamese and French. When--The U.S. got involved starting in about 1953 or 1954. Why--Eisenhower thought that if North Vietnam won, communism would spread throughout Southeast Asia. This became know as the "Domino Theory." Kennedy and the following presidents just continued the job.
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13y ago

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