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In short, it was a policy of containment that the United States had started to practice after the end of WWII. The US felt threatened by the Communist influence spreading throught the world and decided that they had to stop the communists at any costs. This is also the reason the United States got involved in Vietnam. Truman would not let the US forces cross into North Korea, just push their army back to their side of the border.

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18y ago

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