World War 2
Pearl Harbor
Japan in WW2

What effect did the attack of Pearl Harbor have on the European War?

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Wiki User
07/27/2008

It made a crucial change. When the US declared war on Japan for obvious reasons, it also declared war on Germany & Italy. If the US was going to war then it might as well go into Europe as well as the Pacific. but the difference it made to the war in Europe was wholly important to the defeat of Germany & Italy.