HISTORICAL CHRONOLOGY

On This Day in History

Discover key historical events within the Genesis range (1950–2049) that occurred on this calendar day, and claim their commemorative registry plaques.

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Historical chronology for December 20

December 20

8 historical milestones registered between 1950 and 2049

December 20, 1951 AVAILABLE

Experimental 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.

Wikipedia: Experimental Breeder Reactor I
Experimental Breeder Reactor I
December 20, 1980 AVAILABLE

NBC aired the American football match between the New York Jets and the Miami Dolphins without announcers.

Wikipedia: NBC
NBC
December 20, 1984 AVAILABLE

Twelve-year-old Jonelle Matthews disappeared from her home in Greeley, Colorado; her body was not discovered until 2019.

Wikipedia: Murder of Jonelle Matthews
Murder of Jonelle Matthews
December 20, 1987 AVAILABLE

The deadliest peacetime maritime disaster in history occurred when the MV Doña Paz (pictured) sank after colliding with an oil tanker in the Tablas Strait in the Philippines, resulting in an estimated 4,385 deaths.

Wikipedia: List of maritime disasters
December 20, 1995 AVAILABLE

Mandated by the Dayton Agreement that ended the Bosnian War, the NATO-led Implementation Force (troops pictured) began peacekeeping operations in Bosnia and Herzegovina.

Wikipedia: Dayton Agreement
Dayton Agreement
December 20, 1995 AVAILABLE

American Airlines Flight 965 crashed into a mountain in Buga, Colombia, killing 159 of the 163 people on board.

Wikipedia: American Airlines Flight 965
American Airlines Flight 965
December 20, 1999 AVAILABLE

Portugal transferred the sovereignty over Macau, which it had administered since the mid–16th century, to China.

Wikipedia: Handover of Macau
Handover of Macau
December 20, 2007 AVAILABLE

Pablo Picasso's Portrait of Suzanne Bloch was stolen from the São Paulo Museum of Art before being recovered about three weeks later.

Wikipedia: Pablo Picasso
Pablo Picasso