What were 3 reasons germany gained the united states as an enemy

Germany sunk a US boat and the US declared war on Germany because they killed many Americans

11 December1941 four days after the Japanese attack on Pearl Harbor and the United ... Hitler'sreasons for declaring war against the US when he was not obligated to were numerous. Germanyever since the outbreak of the European war, provoked by the British declaration of war against Germanyon September 3  also trump not to be ,mean

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