World War I Timeline By MikhailEllison Period: Jan 1, 1914 to Dec 31, 1920 WWI 1914-1920 Jun 28, 1914 Assassination Archduke Franz http://www.history.com/this-day-in-history/archduke-franz-ferdinand-assassinated Jul 5, 1914 Germany Promises Austrians Support http://www.history.com/this-day-in-history/germany-gives-austria-hungary-blank-check-assurance Jul 28, 1914 Austria Declares War On Serbia http://www.history.com/this-day-in-history/austria-hungary-declares-war-on-serbia May 7, 1915 Sinking of the Lusitania http://www.history.com/topics/world-war-i/lusitania Feb 21, 1916 Battle of Verdun http://www.history.com/topics/world-war-i/battle-of-verdun Feb 1, 1917 Unrestricted Submarine Warfare http://www.history.com/this-day-in-history/germany-resumes-unrestricted-submarine-warfare Apr 6, 1917 U.S. Enters WWI http://www.history.com/this-day-in-history/us-enters-world-war-i Mar 3, 1918 Treaty of Brest-Litovsk Russia exits war Nov 11, 1918 Germany Signs Armstice http://www.history.com/this-day-in-history/world-war-i-comes-to-an-end Jun 28, 1919 The Treaty of Versailles http://www.history.com/topics/world-war-i/treaty-of-versailles