Changes in Society in 1920 By Cmeloon 1917 Literacy Test act 1919 General Intelligence Division of federal government 1919 19th Amendment was passed 1920 Palmer raids Period: 1920 to 1933 18th Amendment in place 1921 Emergency Immigration Act Period: 1921 to 1924 KKK membership increased 3.9 million 1924 Johnson-Reed immigration act 1929 Congress declared only 120,000 Feb 14, 1929 Valentine's Day massacre