Estimated peak membership in the Ku Klux Klan during the 1920s: 4 million
Estimated peak membership in the Ku Klux Klan during the 1870s: 500,000
Estimated peak membership in the Ku Klux Klan during the 1960s: 20,000

Years D.W. Griffith's Ku Klux Klan-glorifying epic, The Birth of a Nation, held the record for highest-grossing Hollywood picture: 22
Film that finally broke The Birth of a Nation's record: Walt Disney's Snow White and the Seven Dwarfs

Estimated income of bootleg liquor industry in 1929: $3 billion
Entire United States federal budget in 1929: $2.9 billion¹⁸

Estimated number of speakeasies (illegal saloons) in United States during prohibition: 200,000–500,000¹⁹