U.S to war By asullivan18 Jul 28, 1914 WW1 begins Aug 19, 1914 declaration of neutrality May 7, 1915 German sub sinks the Lusitanian May 4, 1916 sussex pledge Jan 19, 1917 zimmereman note Feb 16, 1917 sussex pledge ended Mar 15, 1917 German subs sink 2 more U.S ships Apr 17, 1917 Declaration of war