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The United States was pulled into World War II primarily due to the Japanese attack on Pearl Harbor on December 7, 1941, which resulted in significant loss of life and damage to the Pacific Fleet. Following the attack, President Franklin D. Roosevelt declared war on Japan the next day. Subsequently, Germany and Italy declared war on the United States, prompting America to fully enter the conflict on multiple fronts. Prior to this, U.S. support for the Allies had been increasing through programs like Lend-Lease, but the attack on Pearl Harbor galvanized public opinion for direct military involvement.

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