September 10 is the 253rd day of the year (254th in leap years). There are 112 days remaining.
- 1913: First paved coast-to-coast highway opened in the US.
- 1919: Austria and the Allies signed a treaty recognizing the independence of Poland, Hungary, Czechoslovakia and Yugoslavia.
- 1939: Canada declared war on Germany.
- 1943: German forces begin their occupation of Rome during World War II.
- 1951: Great Britain began an economic boycott of Iran.
- 1990: Will Smith made his debut in the Television show "The Fresh Prince of Bel-Air."
- 1920: Fabio Taglioni, automotive engineer
- 1957: Siobhan Fahey, Singer (Bananarama, Shakespeare's Sister)