1920-1930 1921 Warren G. Harding takes oath on March 4; becomes 29th President. 1921 Famous race horse, Man O' War retired to stud. Lives another 26 years. 1922 King Tutankhamun's tomb discovered on Nov. 4, by Howard Carter. 1922 U.S.S.R. created. Includes Russia, Byelorussia, Transcaucasia, and Ukraine. 1922 Teapot Dome scandal involves illegal lease on Navy oil reserves. 1923 Warren G. Harding dies Aug 2 from heart attack in San Francisco. 1923 Calvin Coolidge takes oath on August 3; becomes 30th President. 1924 Congress confers citizenship on (some) Native Americans, June 15. 1924 Lenin dies and Stalin takes over in U.S.S.R. 1924 Covenant of The League of Nations, including Amendments, Dec, 1924. 1925 First female state governor is Nellie Taylor Ross, in Wyoming. 1925 First commercial diesel-electric trains begin service. 1925 Calvin Coolidge takes oath on March 4; begins second term. 1925 John T. Scopes convicted in TN "monkey trial." Teaching evolution. 1926 Richard E. Byrd flies over North Pole May 9. 1927 Charles Lindbergh lands in Paris May 21 after non-stop flight from NY. 1928 Richard E. Byrd flies over South Pole November 28. 1929 St. Valentine's Day massacre in Chicago by rival bootleggers. 1929 Herbert C. Hoover takes oath on March 4; becomes 31st President. 1929 Television is demonstrated by Vladimir K. Zworykin. 1929 Great Depression begins after bank and stock failures in October. 1930 Construction begins on Hoover Dam near Las Vegas--July 7.