1910 - Boy Scouts of America chartered 1911 - Supreme Court breaks up Standard Oil 1911 - First ever Indianapolis 500 is staged; Ray Harroun is the first winner 1912 - RMS Titanic sinks 1912 - New Mexico and Arizona become states 1912 - Girl Scouts of the USA was started by Juliette Gordon Low 1912 - Theodore Roosevelt shot, but not killed, while campaigning for the Bull Moose Party 1913 - Woodrow Wilson becomes President 1913 - Henry Ford develops the modern assembly line 1913 - Worth County Extension was organized thru Farm Bureau 1914 - Mother's Day established as a national holiday 1915 - RMS Lusitania sunk 1917 - U.S. enters World War I 1918 - Treaty of Versailles ends World War I 1919 - United states Senate rejects Treaty of Versailles and League of Nations 1919 - 18th Amendments, establishing Prohibition