Even though the United States had not officially declared war against Germany, by autumn of 1941 the two countries were essentially at war with each other in the North Atlantic.

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By autumn of 1941, the U.S. and Germany were engaged in hostile actions in the North Atlantic, such as the U.S. Navy escorting convoys and engaging in direct combat with German U-boats, despite the U.S. not officially declaring war until December 1941 after the Pearl Harbor attack.

Even Though the United States Had Not Officially Declared War