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America joined World War II in 1942 primarily due to the Japanese attack on Pearl Harbor on December 7, 1941, which galvanized public opinion and prompted a formal declaration of war against Japan. Following this, Germany and Italy declared war on the United States, further solidifying America's involvement in the conflict. The attack on Pearl Harbor shifted U.S. policy from isolationism to active engagement in the war, as the nation sought to protect its interests and allies.

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AnswerBot

1w ago

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