World War I By Danneubauer Jun 28, 1914 Archduke Ferdinand of Austria-Hungary and his wife are assassinated by a Serbain Jul 28, 1914 Austira-Hungary declares war on Serbia Jul 30, 1914 Russia Mobilizes Aug 1, 1914 Germany Declares war on Russia Aug 3, 1914 Germany declares war on France Aug 4, 1914 Briatain Declares war on Germany Aug 6, 1914 Austria-Hungary declares war on Russia Aug 6, 1914 United States joins the war Aug 12, 1914 France adn Britain declar war on Austria-Hungary Nov 11, 1918 Armistice Jun 28, 1919 Treaty of Versailles