U.S. Entry into World War I, 1917. ... Wilson cited Germany's violation of its pledge to suspend unrestricted submarine warfare in the North Atlantic and the Mediterranean, as well as its attempts to entice Mexico into an alliance against the United States, as his reasons for declaring war.
American Loans.The US had a vested financial intereste in the autcome of the war in europe.American business and banks make huge loans to the allies. If they didn-t win then they were unlikely to get their money back
