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The Japanese bombing the U.S fleet at Pearl Harbour, Hawaii on the 7th December 1941 is what ultimatley caused the U.S to declare war during World War 2.

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Q: What event caused the us to declare war?
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What event caused the US to declare war on Spain in 1898?

An economic reason for the United States to declare war on Spain in 1898 included protecting US interests in Cuba.


What was happening in Europe that caused the US to declare war on Germany?

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