1900 - 1920 By facebooker_2165144867097231 Sep 6, 1901 Assassination of President McKinley Period: Sep 14, 1901 to Mar 4, 1909 President Theodore Roosevelt (26th President) Nov 18, 1901 Hay-Pauncefote Treaty Jul 17, 1902 Reclamation Act Nov 18, 1903 Hay-Bunau-Varilla Treaty Dec 17, 1903 Wright Brother First Flight Sep 5, 1905 Treaty of Portsmouth Nov 16, 1907 Oklahoma Becomes A State Period: Mar 4, 1909 to Mar 4, 1913 President William Howard Taft (27th President) Jun 25, 1910 Mann Act Jan 6, 1912 New Mexico Becomes A State Feb 14, 1912 Arizona Becomes A State Mar 12, 1912 Girl Scouts Founded Apr 14, 1912 Titanic Sinks Feb 3, 1913 16th Amendment Period: Mar 4, 1913 to Mar 4, 1921 President Woodrow Wilson (28th President) Apr 8, 1913 17th Amendment Period: Jul 28, 1914 to Nov 11, 1918 World War 1 Sep 26, 1914 Federal Trade Commission Founded Jan 16, 1919 18th Amendment Jun 28, 1919 Treaty of Versailles Aug 18, 1920 19th Amendment