- 1819 – By the Adams-OnÃs Treaty, Spain sells Florida to the United States for five million U.S. dollars.
- 1879 – In Utica, New York, Frank Woolworth opens the first of many of 5 and dime Woolworth stores.
- 1924 – U.S. President Calvin Coolidge becomes the first President to deliver a radio broadcast from the White House.
- 1997 – In Roslin, Scotland, scientists announce that an adult sheep named Dolly has been successfully cloned.