Final answer:
The United States got involved in the Vietnam War to contain communism and support the democratic government in South Vietnam.
Step-by-step explanation:
The correct statement that best describes why the United States got involved in the Vietnam War is option C. The United States wanted to contain communism and support the democratic government in South Vietnam.
The United States' involvement in the Vietnam War was primarily driven by its desire to prevent the spread of communism in Southeast Asia. The United States saw South Vietnam as a key ally in the region and believed that supporting the democratic government in the south would help contain the spread of communism.
This belief was based on the domino theory, which suggested that if one country fell to communism, neighboring countries would also become communist. The United States feared that if South Vietnam fell to communism, it would lead to a chain reaction of communist takeovers in other countries in the region.
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