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The Brittish trade boat The Lusitania had Americans on board when it was attacked by German Uboats. This angered the American public.
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In the Sussex Pledge Germany agreed not to use their Uboats against American trade ships
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Germany Broke the sussex pledge
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The Brittish intercepted a note from Germany to Mexico that discussed how Germany would give Mexico Land if Mexico attacked the U.S.
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American Trade Ships continued to be attacked by German Uboats.
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