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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.
The attack on Pearl Harbor on December 7, 1941. Congress declared war on Japan December 8, 1941.
2 events caused the USA to enter WW2. 1 was the surprise attack of Japan on Pearl Harbor on December 7th, 1941. The other was the declaration of war on the USA by Germany.

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The US entered WW2 because Japan attacked Pearl Harbor

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9y ago
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Q: Why did the US enter World War 2?
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