Wikipedia:Selected anniversaries/December 6

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 * 963 – Leo VIII was ordained a bishop, claiming the Holy See as an antipope supported by Otto the Great.
 * 1240 – After days of bombardment, Mongol invaders under Batu Khan breached the walls of Kiev and plundered the city, slaughtering its inhabitants.
 * 1803 – Haitian Revolution: Nearly all the final French ships in Haiti were captured by the Royal Navy when they attempted to evade the blockade of Saint-Domingue.
 * 1865 – Slavery in the United States was officially abolished when the Thirteenth Amendment to the U.S. Constitution was ratified.
 * 1904 – President Theodore Roosevelt announced the Roosevelt Corollary to the Monroe Doctrine, justifying the exercise of "international police power" by the U.S. in the Western Hemisphere.
 * 1907 – A mine explosion in Monongah, West Virginia, killed 362 people and led to the establishment of the United States Bureau of Mines.
 * 1917 – A ship in Halifax Harbour, Nova Scotia, Canada, carrying TNT and picric acid caught fire after a collision with another ship and caused the second-largest man-made accidental explosion in history.
 * 1917 – World War I: USS Jacob Jones (DD-61) became the first American destroyer to be sunk by enemy action when it was torpedoed by German submarine SM U-53.
 * 1933 — In United States v. One Book Called Ulysses  Judge John M. Woolsey ruled that James Joyce's novel Ulysses was not obscene, allowing it to be imported into the United States.
 * 1941 – The British Secret Intelligence Service established a facility known as Camp X (pictured) in Ontario, Canada, to train covert agents in clandestine operations.
 * 1942 – The Holocaust: Members of German Ordnungspolizei massacred 31 people in occupied Poland for helping Jews.
 * 1956 – In what became known as the "Blood in the Water" match at the Melbourne Olympics, the Hungarian water polo team defeated the USSR 4–0 against the background of the Hungarian Revolution.
 * 1957 – The first U.S. attempt to launch a satellite failed with an explosion on the launch pad at Cape Canaveral.
 * 1967 – American physician Adrian Kantrowitz and his team performed the world's first pediatric heart transplant at Maimonides Medical Center in New York City.
 * 1975 – Four members of the Provisional Irish Republican Army took two people hostage in a house on Balcombe Street in London, surrendering six days later.
 * 1982 – The Irish National Liberation Army exploded a time bomb in Ballykelly, Northern Ireland, killing eleven British Army soldiers and six civilians.
 * 1989 – Claiming to be "fighting feminism", 25-year-old Marc Lépine killed fourteen women before committing suicide at the École Polytechnique in Montreal, Canada.
 * 1990 – An Italian Air Force military jet, abandoned by its pilot after an on-board fire, crashed into a high school near Bologna, killing 12 students and injuring 88 other people.
 * 1992 – The Babri Masjid in Ayodhya, India, was demolished by Hindu Kar Sevaks, who believed that it was built on the birthplace of Rama.
 * 1999 – The Recording Industry Association of America filed a lawsuit against the peer-to-peer file sharing network Napster, alleging that the service facilitated widespread copyright infringement.
 * 2005 – An Iranian Lockheed C-130 transport aircraft crashed into a ten-floor apartment building in a residential area of Tehran, killing over 100 people.
 * 2015 – In the Venezuelan parliamentary election, the ruling United Socialist Party lost control of the National Assembly for the first time in 16 years.
 * Born/died: | Jan van Scorel |d|1562| Maria de Dominici |b|1645| Marie Adélaïde of Savoy |b|1685| Guillaume-Chrétien de Lamoignon de Malesherbes |b|1721|  Robert Spear Hudson |b|1812| William Arnott |b|1827| George H. D. Gossip|b|1841| Mary Margaret O'Reilly |d|1949| Satoru Iwata |b|1959| Pete Rozelle |d|1996