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The US declared war against Japan because Japan attacked US territories in the Pacific Ocean. The US did not declare war on Germany and Italy. They declared war on the US following the US declaration of War on Japan.

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14y ago
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12y ago

When the Japanese destroyed most of the US Fleet on Dec. 7 1941. US troops casulties sumed to over 3000! while the Japs lost less than 100. President Roosevelt Declared war on Japan, and Germany.

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Q: Why did America go to war in 1941?
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When did america go to war against germany?

December 7th 1941 after the attack on Pearl Harbour


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