World War I By jamiewiley Jun 28, 1914 Archduke Ferdinand of Austria-Hungary and his wife are assassinated Jul 28, 1914 Austria-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 Britain declares war on Germany Aug 6, 1914 Austria-Hungary declares war on Russia Aug 12, 1914 France and Britain declare war on Austria-Hungary Apr 6, 1917 The US joins the war Nov 11, 1918 The Armistice of 11 November 1918 takes place Jun 28, 1919 The war formally ends with the Treaty of Versailles
