World War Timeline By lacey_bradshaw01 Jun 28, 1914 Assassination of ArchDuke Franz Ferdinand Jul 28, 1914 Official start of World War 1 Austria- Hungary declared war on Serbia Aug 1, 1914 Germany enters the war Declares war on Russia Aug 2, 1914 Russia joined the war Aug 3, 1914 France joins the war Germany declares war on France May 23, 1915 Italy joined the war Apr 6, 1916 The United States enters the war 1917 The Zimmerman note was sent to Mexico Nov 11, 1918 Official end of the war Jun 28, 1919 Signing of the Treaty of Versailles
