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The trigger to the US actually declaring war was the Japanese attack on Pearl Harbor. Prior to this the US was actively supporting Great Britain against Germany by Lend-lease. There was a strong feeling of Isolationism in the US, & it is doubtful that the British could have been effective in Europe had the US not sided with the Allies. It does beg the question what the world would now be like had the US remained neutral....

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17y ago

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