March 1 » Henri Becquerel discovers radioactive decay.
May 26 » Charles Dow publishes the first edition of the Dow Jones Industrial Average.
June 4 » Henry Ford completes the Ford Quadricycle, his first gasoline-powered automobile, and gives it a successful test run.
June 15 » The deadliest tsunami in Japan's history kills more than 22,000 people.
December 14 » The Glasgow Underground Railway is opened by the Glasgow District Subway Company.
December 30 » Filipino patriot and reform advocate José Rizal is executed by a Spanish firing squad in Manila.
Day of marriage April 30, 1921
The temperature on April 30, 1921 was between 6.8 °C and 20.2 °C and averaged 13.7 °C. There was 12.0 hours of sunshine (81%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the 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.
March 18 » The Kronstadt rebellion is suppressed by the Red Army.
April 11 » Emir Abdullah establishes the first centralised government in the newly created British protectorate of Transjordan.
May 3 » The Government of Ireland Act 1920 is passed, dividing Ireland into Northern Ireland and Southern Ireland.
July 2 » World War I: U.S. President Warren G. Harding signs the Knox–Porter Resolution formally ending the war between the United States and Germany.
September 5 » Roscoe "Fatty" Arbuckle party in San Francisco ends with the death of the young actress Virginia Rappe: One of the first scandals of the Hollywood community.
November 4 » The Saalschutz Abteilung (hall defense detachment) of the Nazi Party is renamed the Sturmabteilung (storm detachment) after a large riot in Munich.
Day of death March 11, 1954
The temperature on March 11, 1954 was between -0.5 °C and 14.8 °C and averaged 5.7 °C. There was 0.1 mm of rain. There was 4.2 hours of sunshine (36%). The almost cloudless was. The average windspeed was 2 Bft (weak wind) and was prevailing from the northeast. Source: KNMI
April 7 » United States President Dwight D. Eisenhower gives his "domino theory" speech during a news conference.
May 17 » The United States Supreme Court hands down a unanimous decision in Brown v. Board of Education of Topeka, Kansas, outlawing racial segregation in public schools.
September 3 » The German submarineU-505 begins its move from a specially constructed dock to its site at Chicago's Museum of Science and Industry.
September 3 » The People's Liberation Army begins shelling the Republic of China-controlled islands of Quemoy, starting the First Taiwan Strait Crisis.
September 11 » Hurricane Edna hits New England as a Category 2 hurricane, causing significant damage and 29 deaths.
November 22 » The Humane Society of the United States is founded.
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/I136957.php : accessed October 24, 2026), "Hendrik van der Kooy (1896-1954)".
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