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When the Germans sank the the English luxury liner, Lusitania in the 1915, where American passengers were on board. Not really seeing as the Lusitania was sunk in 1915 and America didn't join the war until the 6th of April 1917. Economic interests contributed as well as the Zimmerman telegraph. It was unrestricted submarine warfare in general and not just the sinkin of the Lusitania but also the Arabic and Sussex. After the Lusitania was sunk, Germany stopped the unrestricted submarine warfare but in January 1917 they resumed it. Also Germany had tried to persuade Mexico to join world war I and attack the U.S. the sinking of the lusitania

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16y ago

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