Katie Norton 2 By knorton17 Aug 1, 1914 Declaration of Neuatrality Period: Aug 1, 1914 to Apr 1, 1917 United States into WWI May 1, 1915 The Lusitania May 1, 1916 Sussex pledge Made Jan 1, 1917 Zimmernan Note Feb 1, 1917 Zimmerman Note Feb 1, 1917 Sussex Plegde Ended Mar 1, 1917 Zimmerman Note Mar 1, 1917 3 American Ships Targeted Apr 1, 1917 Declaration of War