The United States entered the second world war due to the attack on pearl harbor. The answer to this question is c.
Prior to the involvement of the United States in the Second world war, they had an isolationism policy.
The policy had the United States being uninvolved in the war that was involving the rest of the world.
Pearl Harbor was attacked by the Japanese because they intended to keep the United States naval fleet from interfering with its plans against territories of the US, UK and the Netherlands.
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