1920s By esh753 Period: Jan 1, 1915 to Jan 1, 1939 The Jazz Age and the Depression May 9, 1919 Prohibition Period: Jan 1, 1921 to Jan 1, 1924 Presidency of Warren G Harding Period: Jan 1, 1923 to Jan 1, 1929 Presjdency of Calvin Coolidge May 9, 1924 Dawes Plan Jul 21, 1925 Scopes Trial Decision Aug 23, 1927 Sacco and Vanzetti executed May 9, 1928 Kellogg-Briand Treaty Period: Jan 1, 1929 to Jan 1, 1933 Presidency of Herbert Hoover Oct 29, 1929 Stock Market Crash May 9, 1930 Hawley-Smoot Tariff 1930 Jan 1, 1933 Prphibition Repealed Period: Jan 1, 1933 to Jan 1, 1945 Presidency of FDR May 9, 1935 Social Security Act 1935