World War 1 By Kasplazm Jun 28, 1914 Archduke Franz Ferdinand Assasinated Period: Jun 28, 1914 to Nov 11, 1918 World War 1 Jul 28, 1914 Austria-Hungary declares war on Serbia Aug 4, 1914 Germany invades Belgium Aug 4, 1914 Great Britain declares war on Germany May 7, 1915 German submarine sinks Lusitania Feb 21, 1916 Battle of Verdun begins Mar 8, 1917 February Revolution begins in Russia Apr 6, 1917 The US declares war on Germany Nov 7, 1917 October Revolution begins in Russia Nov 11, 1918 Germany signs an armistice, ending World War 1