January 13 » First Italo-Ethiopian War: the war's opening battle, the Battle of Coatit, occurs; it is an Italian victory.
April 6 » Oscar Wilde is arrested in the Cadogan Hotel, London, after losing a libel case against the Marquess of Queensberry.
May 7 » In Saint Petersburg, Russian scientist Alexander Stepanovich Popov demonstrates to the Russian Physical and Chemical Society his invention, the Popov lightning detector—a primitive radio receiver. In some parts of the former Soviet Union the anniversary of this day is celebrated as Radio Day.
August 31 » German Count Ferdinand von Zeppelin patents his navigable balloon.
October 8 » Korean Empress Myeongseong is assassinated by Japanese infiltrators.
November 5 » George B. Selden is granted the first U.S. patent for an automobile.
Day of marriage July 21, 1921
The temperature on July 21, 1921 was between 8.2 °C and 22.1 °C and averaged 16.3 °C. There was 9.9 hours of sunshine (62%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the 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.
February 15 » Kingdom of Romania establishes its legation in Helsinki.
February 21 » Constituent Assembly of the Democratic Republic of Georgia adopts the country's first constitution.
May 3 » West Virginia becomes the first state to legislate a broad sales tax, but does not implement it until a number of years later due to enforcement issues.
May 31 » The Tulsa race massacre kills at least 39, but other estimates of black fatalities vary from 55 to about 300.
August 28 » The Red Army dissolved the Free Territory, after driving the Black Army out of Ukraine.
September 11 » Nahalal, the first moshav in Palestine, is settled as part of a Zionist plan of creating a Jewish state, later to be Israel.
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/I131808.php : accessed October 17, 2026), "Durk Klaas de Boer (1895-????)".
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