The United States became involved in the Korean and Vietnam conflicts mainly to stop the spread of communism in Vietnam.
The basic concept became that the individuals had to save the first domino from falling (the country turning to communism) as a way to prevent the unfolding of communism. As such, historians now argue that the USA used the Domino idea to justify its involvement in Korea, just as it did in the later Vietnam war.
The USA wanted now not just to include communism - additionally, they desired to prevent the domino impact. Truman changed into worried that if Korea fell, the following united states of America to fall could be Japan, which become very crucial for American trade. This becomes in all likelihood the maximum vital reason for the US involvement in the conflict.
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