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The Domino Theory was made popular by former president Eisenhower in 1954. His Domino Theory speech gave the idea that if one nation falls to communism, then more will come with it.
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The Gulf of Tonkin Resolution was given by congress to Johnson so that he could increase U.S. involvement in the war.
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Johnson ordered the first of many deployments to Vietnam in 1965. They arrived near Da Nang in South Vietnam.