World Wars By Danny Berg Period: Jan 1, 1914 to Dec 31, 1918 WORLD WAR I Jun 28, 1914 Archduke Ferdinand Assasinated Jul 23, 1914 Austrian Government threatens Serbia Jul 31, 1914 Russia mobilizes army Aug 1, 1914 Germany declares war on Russia Aug 3, 1914 Germany Declares War on France Aug 4, 1914 Great Britain Declares War on Germany Feb 1, 1915 German blockade created May 7, 1915 Germans sink Lusitainia Jun 8, 1916 National Defense Act passed