February 20: Family Day in various regions of Canada (2017)
- 1685 – French colonists, led by Robert de La Salle, landed at Matagorda Bay in present-day Texas, which later allowed the United States to claim the region as part of the Louisiana Purchase.
- 1846 – Polish insurgents led an uprising in the Free City of Kraków to incite a fight for national independence that was put down by the Austrian Empire nine days later.
- 1943 – A fissure opened in a cornfield in the Mexican state of Michoacán and turned into the cinder cone volcano Parícutin, growing 424 m (1,391 ft) in eight years.
- 1965 – NASA's Ranger 8 spacecraft successfully transmitted 7,137 photographs (sample pictured) of the Moon in the final 23 minutes of its mission before crashing into Mare Tranquillitatis.
- 1988 – The Nagorno-Karabakh Autonomous Oblast voted to secede from Azerbaijan and join Armenia, triggering the Nagorno-Karabakh War.
Hod Stuart (b. 1879) · Maria Goeppert-Mayer (d. 1972)
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