The Roaring Twenties By crazygirljane Jan 1, 1920 Radio Broadcasting Jan 16, 1920 Volstead Act Jan 1, 1921 Earle Dickson - Bandaid Jan 9, 1921 The Washington Naval Conference Period: Mar 4, 1921 to Aug 2, 1923 Warren G. Harding as US President Jan 9, 1922 Fordney-McCumber Tariff Act Jan 9, 1922 Insulin Injections for Diabetics Jan 10, 1923 Traffic signal Period: Aug 2, 1923 to Mar 4, 1929 Calvin Coolidge as US President Jan 1, 1924 Immigration Act Mar 8, 1924 Coal mine explosion kills 171 at Castle Gate Utah Apr 1, 1924 The Dawes Plan May 26, 1924 President Coolidge signs immigration law restricting immigration Sep 24, 1924 Boston, Massachusetts, opens its airport Aug 8, 1925 First National Ku Klux Klan March - Washington D.C Nov 11, 1925 Louis Armstrong records 1st of Hot Five & Hot Seven recordings Mar 16, 1926 First Liquid Feuled Rocket flight - Robert Doddard Jan 1, 1927 The Geneva Naval Conference Jan 9, 1927 Home Refrigeration Jan 9, 1928 First regular television broadcast Jan 9, 1928 Alaxander Fleming - Penicillin Jul 31, 1928 Red Line Agreement Aug 27, 1928 The Kellogg-Briand Pact Feb 14, 1929 St. Valentines Day Massacre - Al Capone
