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Japan's attack on the US Fleet at Pearl Harbor left them with little room to turn the other cheek. Already indirectly aiding Britain desite the fears of isolationists, the US soon committed to defeating both Germany and Japan.

The Americans were forced to join WWII because the Japanese Navy and Air Forces bombed Pearl Harbor on Sunday, Dec 7, 1941. On Monday, Dec 8, 1941, America declared war on Japan. Three days later Germany declared war on the USA.

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Q: Why did the united states finally enter World War II?
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