Wikipedia:Selected anniversaries/December 20
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This is a list of selected December 20 anniversaries that appears on 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 may be controversial, or on a day that is or soon will be on the Main Page, please post your suggestion on the talk page instead.
To report an error when this appears on the Main Page, see Main Page errors.
- 1803 – As part of the Louisiana Purchase, New Orleans was transferred from France to the United States.
- 1917 – The Cheka, the first Soviet secret police, was founded. Felix Dzerzhinsky was appointed as its leader.
- 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 (pictured).
- 1995 – The NATO-led IFOR began peacekeeping in Bosnia and Herzegovina.
- 1999 – Portugal transferred sovereignty of Macau to the People's Republic of China.
More events: December 19 – December 20 – December 21
