March 18 » AFC Ajax Amsterdam, The Netherlands's biggest and most successful football club, was founded.
June 5 » Second Boer War: British soldiers take Pretoria.
June 17 » Boxer Rebellion: Western Allied and Japanese forces capture the Taku Forts in Tianjin, China.
June 20 » Baron Eduard Toll, leader of the Russian Polar Expedition of 1900, departs Saint Petersburg in Russia on the explorer ship Zarya, never to return.
July 27 » Kaiser Wilhelm II makes a speech comparing Germans to Huns; for years afterwards, "Hun" would be a disparaging name for Germans.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of marriage May 21, 1921
The temperature on May 21, 1921 was between 2.0 °C and 19.1 °C and averaged 12.6 °C. There was 12.7 hours of sunshine (80%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. 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.
May 31 » The Tulsa race massacre kills at least 39, but other estimates of black fatalities vary from 55 to about 300.
June 15 » Bessie Coleman earns her pilot's license, becoming the first female pilot of African-American descent.
July 29 » Adolf Hitler becomes leader of the National Socialist German Workers Party.
August 14 » Tannu Uriankhai, later Tuvan People's Republic is established as a completely independent country (which is supported by Soviet Russia).
October 29 » United States: Second trial of Sacco and Vanzetti in Boston, Massachusetts.
November 14 » The Communist Party of Spain is founded, and issues the first edition of Mundo obrero.
Day of death June 30, 1961
The temperature on June 30, 1961 was between 13.3 °C and 28.4 °C and averaged 21.5 °C. There was 14.6 hours of sunshine (87%). The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
January 8 » In France a referendum supports Charles de Gaulle's policies in Algeria.
February 27 » The first congress of the Spanish Trade Union Organisation is inaugurated.
April 17 » Bay of Pigs Invasion: A group of Cuban exiles financed and trained by the CIA lands at the Bay of Pigs in Cuba with the aim of ousting Fidel Castro.
May 24 » American civil rights movement: Freedom Riders are arrested in Jackson, Mississippi, for "disturbing the peace" after disembarking from their bus.
July 4 » On its maiden voyage, the Soviet nuclear-powered submarine K-19 suffers a complete loss of coolant to its reactor. The crew are able to effect repairs, but 22 of them die of radiation poisoning over the following two years.
July 20 » French military forces break the Tunisian siege of Bizerte.
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/I201113.php : accessed February 23, 2026), "Jakob van Oosten (1900-1961)".
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