Events leading US enter War By annweber2015 Jul 28, 1914 Archduke Franz Ferdinand assassinated Blank Hands wanted to kill him Austira HUngray then declares war Aug 1, 1914 Germany declared war on Russia Aug 3, 1914 Germany declares war on France Apr 14, 1915 America was trading supplies with other countries and Germany was causing problems with being able to access the other countries May 7, 1915 German U boat torpedoes a British passenger liner 128 Americans die Jan 25, 1916 Submarine Warfare led US to strengthen military Oct 25, 1916 Propaganda on Germany to influence America Jan 1, 1917 Germany reversed its policy on submarine warfare Mar 1, 1917 Zimmerman telegram Mar 25, 1917 Germans attacked and sank 4 American ships