January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
April 30 » Hawaii becomes a territory of the United States, with Sanford B. Dole as governor.
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.
July 27 » Kaiser Wilhelm II makes a speech comparing Germans to Huns; for years afterwards, "Hun" would be a disparaging name for Germans.
July 29 » In Italy, King Umberto I of Italy is assassinated by the anarchist Gaetano Bresci.
October 19 » Max Planck discovers Planck's law of black-body radiation.
Day of death May 16, 1921
The temperature on May 16, 1921 was between 10.2 °C and 17.8 °C and averaged 13.6 °C. There was 0.3 mm of rain. There was 7.1 hours of sunshine (45%). The average windspeed was 4 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.
January 16 » The Marxist Left in Slovakia and the Transcarpathian Ukraine holds its founding congress in Ľubochňa.
May 19 » The United States Congress passes the Emergency Quota Act establishing national quotas on immigration.
June 20 » Workers of Buckingham and Carnatic Mills in the city of Chennai, India, begin a four-month strike.
July 11 » Former president of the United States William Howard Taft is sworn in as 10th chief justice of the U.S. Supreme Court, becoming the only person ever to hold both offices.
October 8 » KDKA in Pittsburgh's Forbes Field conducts the first live broadcast of a football game.
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: J. van Broekhoven, "Database Van Broekhoven", database, Genealogy Online (https://www.genealogieonline.nl/database-van-broekhoven/I294768.php : accessed March 3, 2026), "Francisca Christina Wierstra (1900-1921)".
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