September 21 events in history

455 Emperor Avitus enters Rome with a Gallic army and consolidates his power
1170 Combined English and Irish forces, under the command of Richard de Clare, Earl of Pembroke and Diarmait Mac Murchada, King of Leinster seize Norse-Gaelic Dublin, forcing Ascall mac Ragnaill, King of Dublin into exile
1217 Livonian Crusade: The Estonian leader Lembitu and Livonian leader Kaupo the Accursed are killed in Battle of Matthew's Day
1435 An agreement between Charles VII of France and Philip the Good ends the partnership between the English and Burgundy in the Hundred Years' War
1745 Battle of Prestonpans: A Hanoverian army under the command of Sir John Cope is defeated, in ten minutes, by the Jacobite forces of Prince Charles Edward Stuart
1776 Part of New York City is burned shortly after being occupied by British forces
1780 American Revolutionary War: Benedict Arnold gives the British the plans to West Point
1792 French Revolution: the National Convention declares France a republic and abolishes the absolute monarchy
1843 John Williams Wilson takes possession of the Strait of Magellan on behalf of the newly independent Chilean government
1860 Second Opium War: an Anglo-French force defeats Chinese troops at the Battle of Palikao
1896 Mahdist War: British forces under the command of Horatio Kitchener takes Dongola in the Sudan
1897 The "Yes, Virginia, there is a Santa Claus" editorial is published in the New York Sun
1898 Empress Dowager Cixi seizes power and ends the Hundred Days' Reform in China
1921 A storage silo in Oppau, Germany, explodes, killing 500-600 people
1933 Salvador Lutteroth ran the first ever EMLL (now CMLL) show in Mexico, marking the birth of Lucha Libre
1934 A large typhoon hits western Honshū, Japan, killing 3,036 people
1937 J. R. R. Tolkien's The Hobbit is published
1938 The Great Hurricane of 1938 makes landfall on Long Island in New York. The death toll is estimated at 500-700 people
1939 Romanian Prime Minister Armand Călinescu is assassinated by far-right legionnaires of the fascist paramilitary organization Iron Guard
1942 The Holocaust: On the Jewish holiday of Yom Kippur, Nazis send over 1,000 Jews of Pidhaytsi (west Ukraine) to Belzec extermination camp
1942 In Poland, at the end of Yom Kippur, Germans order Jews to permanently evacuate Konstantynów and move to the Ghetto in Biała Podlaska, established to assemble Jews from seven nearby towns, including Janów Podlaski, Rossosz and Terespol
1942 In Dunaivtsi, Ukraine, Nazis murder 2,588 Jews
1942 The Boeing B-29 Superfortress makes its maiden flight
1953 Lieutenant No Kum-Sok, a North Korean pilot, defects to South Korea and is associated with Operation Moolah
1961 Maiden flight of the Boeing CH-47 Chinook transportation helicopter
1964 Malta gains independence from the United Kingdom
1964 The North American XB-70 Valkyrie, the world's first Mach 3 bomber, makes its maiden flight from Palmdale, California
1965 Gambia, Maldives and Singapore are admitted as members of the United Nations
1971 Bahrain, Bhutan and Qatar join the United Nations
1972 Philippine President Ferdinand Marcos signs Proclamation № 1081, placing the entire country under martial law and marking the beginning of his authoritarian rule
1976 Orlando Letelier is assassinated in Washington, D.C. He is a member of the Chilean socialist government of Salvador Allende, overthrown in 1973 by Augusto Pinochet
1976 Seychelles joins the United Nations
1977 A nuclear non-proliferation pact is signed by 15 countries, including the United States and the Soviet Union
1981 Sandra Day O'Connor is unanimously approved by the U.S. Senate as the first female Supreme Court justice
1991 Armenia is granted independence from Soviet Union
1993 Russian President Boris Yeltsin suspends parliament and scraps the then-functioning constitution, thus triggering the Russian constitutional crisis of 1993
1999 Chi-Chi earthquake occurs in central Taiwan, leaving about 2,400 people dead
2001 Deep Space 1 flies within 2,200 km of Comet Borrelly
2001 America: A Tribute to Heroes is broadcast by over 35 network and cable channels, raising over $200 million for the victims of the September 11 attacks
2003 Galileo mission is terminated by sending the probe into Jupiter's atmosphere, where it is crushed by the pressure at the lower altitudes
2005 Hurricane Rita becomes the third most intense hurricane (dropped to 4th on October 19, 2005)
2013 Al-Shabaab Islamic militants attack the Westgate shopping mall in Nairobi, Kenya, killing at least 67 people