- September 20, 1881 (136 years ago)
- •Chester A. Arthur is inaugurated as the 21st President of the United States following the assassination of James Garfield.
- September 20, 1967 (50 years ago)
- •The RMS Queen Elizabeth 2 is launched at John Brown & Company, Clydebank, Scotland. It is operated by the Cunard Line.
- September 20, 1979 (38 years ago)
- •Lee Iacocca is elected president of the Chrysler Corporation.
- September 20, 1984 (33 years ago)
- •The Cosby Show debuts on NBC