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Which best explains why the United States sent troops to fight in Vietnam? (USH 8.1.2.d) A. They attacked Pearl Harbor B. The Domino Theory C. China invaded North Vietnam D. The USSR built nuclear missiles in Vietnam

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The best answer to this question is option B. It is the DOMINO THEORY that explains the reason why the United States sent troops to fight in Vietnam. During this war, the United States sent these troops in helicopters in order to help South Vietnam. Hope this answers your question. 
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