February 9 » The Davis Cup competition is established.
March 16 » Sir Arthur Evans purchased the land around the ruins of Knossos, the largest Bronze Age archaeological site on Crete.
March 24 » Mayor of New York City Robert Anderson Van Wyck breaks ground for a new underground "Rapid Transit Railroad" that would link Manhattan and Brooklyn.
May 1 » The Scofield Mine disaster kills over 200 men in Scofield, Utah in what is to date the fifth-worst mining accident in United States history.
July 2 » The first Zeppelin flight takes place on Lake Constance near Friedrichshafen, Germany.
July 27 » Kaiser Wilhelm II makes a speech comparing Germans to Huns; for years afterwards, "Hun" would be a disparaging name for Germans.
Day of marriage June 13, 1921
The temperature on June 13, 1921 was between 10.3 °C and 16.2 °C and averaged 12.9 °C. There was 1.7 mm of rain. There was 0.7 hours of sunshine (4%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. 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.
January 20 » The first Constitution of Turkey is adopted, making fundamental changes in the source and exercise of sovereignty by consecrating the principle of national sovereignty.
March 17 » The Second Polish Republic adopts the March Constitution.
June 15 » Bessie Coleman earns her pilot's license, becoming the first female pilot of African-American descent.
October 5 » The World Series is the first to be broadcast on radio.
October 26 » The Chicago Theatre opens.
December 6 » The Anglo-Irish Treaty is signed in London by British and Irish representatives.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I131786.php : accessed October 25, 2026), "Siebe Nijboer (1900-)".
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