The united states' involvement in the korean war was a result of which of the following? select one: a. treaty obligation to protect japan from attack b. an international effort authorized by the united nations c. membership in the north atlantic treaty organization d. a unilateral effort to prevent the spread of communism in asia

The right answer is  b. An international effort authorized by the United Nations.

Explanation:

The real motive of the USA was to stop what was perceived as a deliberate move of communist expansion in Asia by Moscow and its allies. Actually, it wasn´t so. After the invasion of South Korea by the North, the Truman administration mobilized forces and got a quick resolution by the UN Security Council that allowed the Americans to enter the conflict as a UN force.

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