Was US involvement in Korea justified?

I

in June 1950 communist North Korea invaded South Korea. The United States came to the aid of South Korea at the head of a United Nations force composed of more than a dozen countries. Communist China joined North Korea in the war in November 1950, unleashing a massive Chinese ground attack against American forces.

Explanation:

answer: the third option is your answer

explanation:

the united states began searching for a way to reduce oil

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