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usa i think Turkey, in January 1945. This was of course purely an attempt to be seen to be on the winning side and was 'unserious'. I'd rate it below Costa Rica's declaration of war in December 1941, which was designed to show solidarity with the U.S. and to provide an excuse for seizing German property. Argentina declared war on Germany on 29 March 1945. This was purely a gesture and was intended to avoid giving undue offence to the U.S.

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Germany or Italy on December 11, 1941.

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16y ago
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Q: What was the last country the USA ever declared war on?
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