January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
April 15 » Philippine–American War: Filipino guerrillas launch a surprise attack on U.S. infantry and begin a four-day siege of Catubig, Philippines.
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.
May 26 » Thousand Days' War: The Colombian Conservative Party turns the tide of war in their favor with victory against the Colombian Liberal Party in the Battle of Palonegro.
June 5 » Second Boer War: British soldiers take Pretoria.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
Day of marriage May 15, 1920
The temperature on May 15, 1920 was between 3.9 °C and 15.5 °C and averaged 10.1 °C. There was 13.6 hours of sunshine (87%). 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.
January 19 » The American Civil Liberties Union (ACLU) is founded.
February 13 » The Negro National League is formed.
March 12 » The Kapp Putsch begins when the Marinebrigade Ehrhardt is ordered to march on Berlin.
August 26 » The 19th amendment to United States Constitution takes effect, giving women the right to vote.
September 16 » The Wall Street bombing: A bomb in a horse wagon explodes in front of the J. P. Morgan building in New York City killing 38 and injuring 400.
October 14 » Finland and Soviet Russia sign the Treaty of Tartu, exchanging some territories.
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/I80470.php : accessed October 11, 2026), "Tietje van der Wal (1900-)".
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