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Wikipedia:Selected anniversaries/December 20

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This is a list of selected December 20 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.

Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article, featured list or picture of the day.

To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.

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Images

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Ineligible

Blurb Reason
Yaldā Night (Iran) lots of CN tags (6)
1803 – As part of the Louisiana Purchase, New Orleans in the French territory of Louisiana was officially transferred to the United States. refimprove section
1860South Carolina became the first of eleven slave states to declare secession from the U.S., leading to the eventual creation of the Confederate States of America and later the American Civil War. citations needed and lead too long
1917 – The Cheka, the first Soviet secret police, was established by a decree issued by Vladimir Lenin. lead too short, refimprove section
1941World War II: The Flying Tigers of the Chinese Air Force engaged in its first combat missions. refimprove section
1946Frank Capra's popular Christmas film It's a Wonderful Life was first released in New York City. refimprove section
1948Indonesian National Revolution: Dutch forces captured Yogyakarta, the Indonesian Republic's temporary capital, and seized President Sukarno. unreferenced section and other issues
1951Experimental Breeder Reactor I near Arco, Idaho, U.S., became the world's first electricity-generating nuclear power plant when it became able to illuminate four 200-watt light bulbs. expansion
1957 – The first flight of the Boeing 707, the first commercially successful jet airliner, took place. refimprove section
1968 – The first two confirmed murders by the Zodiac Killer occurred in Benicia, California, in a case which remains unsolved. Too much unreferenced
1973Luis Carrero Blanco, the prime minister of Spain, was assassinated by a bomb planted by members of the Basque nationalist and separatist group ETA. Blanco: needs more footnotes; Assassination: refimprove
1989 – American forces invaded Panama to overthrow the government of Manuel Noriega. refimprove section
2005U.S. district court Judge John E. Jones III ruled against mandating the teaching of "intelligent design" in his ruling on Kitzmiller v. Dover Area School District. refimprove section

Eligible

December 20

Russian and U.S. Implementation Force troops
Russian and U.S. Implementation Force troops
More anniversaries: