world war 1 By yoanacruz1222 Jun 28, 1914 world war 1 cause Archduke Ferdinand is assassinated Aug 2, 1914 ottoman empire declares war ottoman empire declares war on the allies Aug 3, 1914 germany declares war germany declares war on france and russia Jan 31, 1917 U.S. declares war united states enters the war Jun 28, 1919 treaty of versailles ended treaty of versailles is signed ending world war 1
