February 27 » King George I of Greece survives an assassination attempt.
May 1 » Spanish–American War: Battle of Manila Bay: The Asiatic Squadron of the United States Navy destroys the Pacific Squadron of the Spanish Navy after a seven-hour battle. Spain loses all seven of its ships, and 381 Spanish sailors die. There are no American vessel losses or combat deaths.
August 11 » Spanish–American War: American troops enter the city of Mayagüez, Puerto Rico.
September 10 » Empress Elisabeth of Austria is assassinated by Luigi Lucheni.
September 21 » Empress Dowager Cixi seizes power and ends the Hundred Days' Reform in China.
December 3 » The Duquesne Country and Athletic Club defeated an all-star collection of early football players 16–0, in what is considered to be the very first all-star game for professional American football.
Day of marriage July 21, 1920
The temperature on July 21, 1920 was between 14.2 °C and 21.3 °C and averaged 17.9 °C. There was 0.1 mm of rain. There was -0.1 hours of sunshine (0%). The average windspeed was 2 Bft (weak wind) and was prevailing from the west-southwest. 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 12 » The Kapp Putsch begins when the Marinebrigade Ehrhardt is ordered to march on Berlin.
April 28 » Azerbaijan is added to the Soviet Union.
May 9 » Polish–Soviet War: The Polish army under General Edward Rydz-Śmigły celebrates its capture of Kiev with a victory parade on Khreshchatyk.
August 20 » The National Football League is organized as the American Professional Football Conference in Canton, Ohio
August 25 » Polish–Soviet War: Battle of Warsaw, which began on August 13, ends with the Red Army's defeat.
November 2 » In the United States, KDKA of Pittsburgh starts broadcasting as the first commercial radio station. The first broadcast is the result of the 1920 United States presidential election.
When copying data from this family tree, please include a reference to the origin: John Bart, "Family tree Denneman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-denneman/I1104.php : accessed February 7, 2026), "Johannes Sprong (1898-????)".
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