The United States decided to help South Korea mainly because of which of the following?

A need to create more equal trade
A need to keep a military base in Asia***
A need to keep the Soviet Union out of Asia
A need to protect the American economy

You are correct it is B.

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To determine why the United States decided to help South Korea, we need to examine the historical context. The United States' decision to aid South Korea was primarily influenced by the need to keep the Soviet Union out of Asia.

During the Cold War, which lasted from the late 1940s to the early 1990s, there was a global power struggle between the United States and the Soviet Union. The United States aimed to contain the spread of communism and prevent the Soviet Union from gaining influence in other regions.

In 1950, North Korea, with the support of the Soviet Union and China, invaded South Korea in an attempt to unify the peninsula under communism. The United States, under the leadership of President Harry S. Truman, regarded this invasion as a threat to its strategic interests in Asia and as part of the global struggle against communism.

Therefore, the primary motive for the United States' intervention in the Korean War was to prevent the spread of communism and keep the Soviet Union out of Asia. While the United States did establish military bases in South Korea during the conflict, the decision was driven by geopolitical considerations rather than the need to maintain military bases specifically.