May 26 » Charles Dow publishes the first edition of the Dow Jones Industrial Average.
August 16 » Skookum Jim Mason, George Carmack and Dawson Charlie discover gold in a tributary of the Klondike River in Canada, setting off the Klondike Gold Rush.
November 1 » A picture showing the bare breasts of a woman appears in National Geographic magazine for the first time.
November 27 » Also sprach Zarathustra by Richard Strauss is first performed.
December 10 » Alfred Jarry's Ubu Roi premieres in Paris. A riot breaks out at the end of the performance.
Day of marriage November 20, 1920
The temperature on November 20, 1920 was between -1.4 °C and 5.8 °C and averaged 1.4 °C. There was 7.5 hours of sunshine (87%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south east. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
February 2 » The Tartu Peace Treaty is signed between Estonia and Russia.
April 25 » At the San Remo conference, the principal Allied Powers of World War I adopt a resolution to determine the allocation of Class "A" League of Nations mandates for administration of the former Ottoman-ruled lands of the Middle East.
August 13 » Polish–Soviet War: The Battle of Warsaw begins and will last till August 25. The Red Army is defeated.
August 19 » The Tambov Rebellion breaks out, in response to the Bolshevik policy of Prodrazvyorstka.
November 2 » In the United States, KDKA of Pittsburgh starts broadcasting as the first commercial radio station. The first broadcast is the result of the 1920 United States presidential election.
November 12 » Italy and the Kingdom of Serbs, Croats and Slovenes sign the Treaty of Rapallo.
Day of death June 26, 1968
The temperature on June 26, 1968 was between 13.2 °C and 19.1 °C and averaged 15.9 °C. There was 1.2 mm of rain during 2.5 hours. There was 10.0 hours of sunshine (60%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
January 5 » Alexander Dubček comes to power in Czechoslovakia, effectively beginning the "Prague Spring".
January 22 » Operation Igloo White, a US electronic surveillance system to stop communist infiltration into South Vietnam begins installation.
February 16 » In Haleyville, Alabama, the first 9-1-1 emergency telephone system goes into service.
April 7 » Motor racing world champion Jim Clark is killed in an accident during a Formula Two race at Hockenheim.
July 23 » The only successful hijacking of an El Al aircraft takes place when a Boeing 707 carrying ten crew and 38 passengers is taken over by three members of the Popular Front for the Liberation of Palestine. The aircraft was en route from Rome, to Lod, Israel.
October 12 » Equatorial Guinea becomes independent from Spain.
When copying data from this family tree, please include a reference to the origin: Michael Jacobs, "Family tree Jacobs", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-michael-jacobs/I32016.php : accessed January 17, 2026), "Jan Hendrik Koorn (1896-1968)".
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