Wikipedia:Selected anniversaries/December 20: Difference between revisions

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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.

← December 19	December 21 →

December 20

1803 – As part of the Louisiana Purchase, New Orleans in the French territory of Louisiana was officially transferred to the United States.

1860 – South Carolina seceded from the United States, leading to the American Civil War.

1917 – The Cheka (emblem pictured), the first Soviet secret police, was established by a decree issued by Vladimir Lenin.

1951 – Experimental Breeder Reactor I near Arco, Idaho, USA, became the world's first electricity-generating nuclear power plant when it produced sufficient electricity to illuminate four 200-watt light bulbs.

1973 – Spanish Prime Minister Luis Carrero Blanco was assassinated by a bomb planted by members of the Basque nationalist and separatist organisation ETA.

1999 – Portugal transferred sovereignty of Macau to the People's Republic of China.

More anniversaries:

@@ Line 8: / Line 8: @@
 [[Image:First four nuclear lit bulbs.jpeg|100x100px|Four light bulbs were lit with electricity generated from the EBR-1 reactor]]
-{{*mp|21st Anniv in 2008}} [[1987]] &ndash; In one of the worst ever peace-time maritime disasters, an estimated 4,000 people were killed when the [[Philippines|Philippine]]-registered passenger ferry '''''[[MV Doña Paz]]''''' sank after colliding with an oil tanker on the [[Tablas Strait]].
+{{*mp|21st Anniv in 2008}} [[1987]] – In one of the worst ever peace-time maritime disasters, an estimated 4,000 people were killed when the [[Philippines|Philippine]]-registered passenger ferry '''''[[MV Doña Paz]]''''' sank after colliding with an oil tanker on the [[Tablas Strait]].
-{{*mp|20th Anniv in 2008}} [[1988]] &ndash; The '''[[United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances]]''', a treaty mostly devoted to fighting [[organized crime]] by mandating cooperation in tracing and seizing [[Illegal drug trade|drug]]-related assets, was signed in [[Vienna]].
+{{*mp|20th Anniv in 2008}} [[1988]] – The '''[[United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances]]''', a treaty mostly devoted to fighting [[organized crime]] by mandating cooperation in tracing and seizing [[Illegal drug trade|drug]]-related assets, was signed in [[Vienna]].
-{{*mp|19th Anniv in 2008}} [[1989]] &ndash; [[United States|American]] forces '''[[United States invasion of Panama|invaded]]''' [[Panama]] to overthrow the government of dictator [[Manuel Noriega]].
+{{*mp|19th Anniv in 2008}} [[1989]] – [[United States|American]] forces '''[[United States invasion of Panama|invaded]]''' [[Panama]] to overthrow the government of dictator [[Manuel Noriega]].
-{{*mp|13th Anniv in 2008}} [[1995]] &ndash; As per the [[Dayton Agreement]] that ended the [[Bosnian War]], the [[NATO]]-led '''[[IFOR]]''' began peacekeeping in [[Bosnia and Herzegovina]] under the codename [[Operation Joint Endeavor]].
+{{*mp|13th Anniv in 2008}} [[1995]] – As per the [[Dayton Agreement]] that ended the [[Bosnian War]], the [[NATO]]-led '''[[IFOR]]''' began peacekeeping in [[Bosnia and Herzegovina]] under the codename [[Operation Joint Endeavor]].
 -->
@@ Line 18: / Line 18: @@
 [[Image:KGB Symbol.png|100x120px|The sword-and-shield emblem of the Cheka-KGB.]]
 </div>
-{{*mp|205th Anniv in 2008}} [[1803]] &ndash; As part of the [[Louisiana Purchase]]<!--Not bolded, tagged with {{refimprove}}-->, '''[[New Orleans]]''' in the [[New France|French territory]] of [[Louisiana (New France)|Louisiana]] was officially transferred to the [[United States]].
+{{*mp|205th Anniv in 2008}} [[1803]] – As part of the [[Louisiana Purchase]]<!--Not bolded, tagged with {{refimprove}}-->, '''[[New Orleans]]''' in the [[New France|French territory]] of [[Louisiana (New France)|Louisiana]] was officially transferred to the [[United States]].
-{{*mp|148th Anniv in 2008}} [[1860]] &ndash; '''[[South Carolina]]''' [[secession|seceded]] from the [[United States]], leading to the [[American Civil War]].
+{{*mp|148th Anniv in 2008}} [[1860]] – '''[[South Carolina]]''' [[secession|seceded]] from the [[United States]], leading to the [[American Civil War]].
-{{*mp|91st Anniv in 2008}} [[1917]] &ndash; The '''[[Cheka]]''' ''(emblem pictured)'', the first [[Chronology of Soviet secret police agencies|Soviet secret police]], was established by a decree issued by [[Vladimir Lenin]].
+{{*mp|91st Anniv in 2008}} [[1917]] – The '''[[Cheka]]''' ''(emblem pictured)'', the first [[Chronology of Soviet secret police agencies|Soviet secret police]], was established by a decree issued by [[Vladimir Lenin]].
-{{*mp|57th Anniv in 2008}} [[1951]] &ndash; '''[[Experimental Breeder Reactor I]]''' near [[Arco, Idaho|Arco]], [[Idaho]], [[United States|USA]], became the world's first electricity-generating [[nuclear power plant]] when it produced sufficient electricity to illuminate four 200-[[watt]] light bulbs.
+{{*mp|57th Anniv in 2008}} [[1951]] – '''[[Experimental Breeder Reactor I]]''' near [[Arco, Idaho|Arco]], [[Idaho]], [[United States|USA]], became the world's first electricity-generating [[nuclear power plant]] when it produced sufficient electricity to illuminate four 200-[[watt]] light bulbs.
-{{*mp|35th Anniv in 2008}} [[1973]] &ndash; [[Prime Minister of Spain|Spanish Prime Minister]] '''[[Luis Carrero Blanco]]''' [[Operación Ogro|was assassinated]]<!--Not bolded, stubby--> by a bomb planted by members of the [[Basque nationalist]] and separatist organisation [[ETA]].
+{{*mp|35th Anniv in 2008}} [[1973]] – [[Prime Minister of Spain|Spanish Prime Minister]] '''[[Luis Carrero Blanco]]''' [[Operación Ogro|was assassinated]]<!--Not bolded, stubby--> by a bomb planted by members of the [[Basque nationalist]] and separatist organisation [[ETA]].
-{{*mp|9th Anniv in 2008}} [[1999]] &ndash; [[Portugal]] [[Transfer of sovereignty of Macau|transferred sovereignty]]<!--Not bolded, tagged with {{refimprove}}--> of '''[[Macau]]''' to the [[People's Republic of China]].
+{{*mp|9th Anniv in 2008}} [[1999]] – [[Portugal]] [[Transfer of sovereignty of Macau|transferred sovereignty]]<!--Not bolded, tagged with {{refimprove}}--> of '''[[Macau]]''' to the [[People's Republic of China]].
 </li>
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