1752 – The British Empire adopts the Gregorian calendar, skipping eleven days (the previous day was September 2).
1763 – Seneca warriors defeat British forces at the Battle of Devil's Hole during Pontiac's War.
1814 – The poem Defence of Fort McHenry is written by Francis Scott Key. The poem is later used as the lyrics of The Star-Spangled Banner.
1847 – Mexican–American War: Winfield Scott captures Mexico City.
1862 – American Civil War: The Battle of South Mountain, part of the Maryland Campaign, is fought.
1901 – U.S. President William McKinley dies after an assassination attempt on September 6, and is succeeded by Vice President Theodore Roosevelt.
1944 – World War II: Maastricht becomes the first Dutch city to be liberated by allied forces.
1969 – The US Selective Service selects September 14 as the First Draft Lottery date.
1975 – The first American saint, Elizabeth Ann Seton, is canonized by Pope Paul VI.
1984 – Joe Kittinger becomes the first person to fly a gas balloon alone across the Atlantic Ocean.
1985 – The Golden Girls a television sitcom premieres on NBC
1987 – The Toronto Blue Jays set a record for the most home runs in a single game, hitting 10 of them.
1994 – The Major League Baseball season is canceled because of a strike.
2001 – Historic National Prayer Service held at Washington National Cathedral for victims of the September 11 attacks. A similar service is held in Canada on Parliament Hill, the largest vigil ever held in the nation's capital.
1879 – Margaret Sanger, American nurse and activist (d. 1966)
1911 – William H. Armstrong, American author and educator (d. 1999)
1914 – Clayton Moore, American actor (d. 1999)
1936 – Walter Koenig, American actor, producer, and screenwriter
1973 – Nas, American rapper and actor (The Firm)
1836 – Aaron Burr, American colonel and politician, 3rd Vice President of the United States (b. 1756)
1851 – James Fenimore Cooper, American soldier and author (b. 1789)
1901 – William McKinley, American soldier, lawyer, and politician, 25th President of the United States (b. 1843)
1927 – Isadora Duncan, American-Russian dancer and choreographer (b. 1877)
1981 – William Loeb III, American publisher (b. 1905)
1982 – Grace Kelly, American-Monacan actress and singer (b. 1929)
2015 – Fred DeLuca, American businessman, co-founded Subway (b. 1947)
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