The Early 19th Century By tomboylx531 Period: Apr 21, 1898 to Aug 12, 1898 Spanish-American War Jul 6, 1898 Annexation of Hawaii Jul 1, 1900 Open Door Policy Period: May 4, 1904 to Aug 15, 1914 Panama Canal Construction Period: Jan 1, 1909 to Jan 1, 1913 Dollar Diplomacy Jun 28, 1914 Assassination of Franz Ferdinand Period: Sep 5, 1914 to Sep 12, 1914 First Battle of the Marne May 7, 1915 Sinking of the Lusitania Period: Feb 21, 1916 to Dec 18, 1916 Battle of Verdun Period: Jul 1, 1916 to Nov 18, 1916 Battle of the Somme Apr 6, 1917 US Declares War on Germany Oct 1, 1917 Communist Revolution- Russia Period: Jul 15, 1918 to Aug 1, 1918 Second Battle of the Marne Nov 11, 1918 Armistice Jan 16, 1919 18th Amendment Jul 21, 1925 Scopes Trial May 20, 1927 Lindbergh Crosses Atlantic Nov 11, 1927 Sacco and Vanzetti Trial