July 25 » Spanish-American War: The American invasion of Spanish-held Puerto Rico begins, as United States Army troops under General Nelson A. Miles land and secure the port at Guánica.
August 13 » Carl Gustav Witt discovers 433 Eros, the first near-Earth asteroid to be found.
August 25 » Seven hundred Greek civilians, 17 British guards and the British Consul of Crete are killed by a Turkish mob in Heraklion, Greece.
August 28 » Caleb Bradham's beverage "Brad's Drink" is renamed "Pepsi-Cola".
September 21 » Empress Dowager Cixi seizes power and ends the Hundred Days' Reform in China.
October 1 » The Vienna University of Economics and Business Administration is founded under the name k.u.k. Exportakademie.
Day of marriage September 11, 1919
The temperature on September 11, 1919 was between 11.9 °C and 29.3 °C and averaged 20.1 °C. There was 10.9 hours of sunshine (84%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. 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 18 » World War I: The Paris Peace Conference opens in Versailles, France.
March 1 » March 1st Movement begins in Korea under Japanese rule.
April 16 » Polish–Soviet War: The Polish army launches the Vilna offensive to capture Vilnius in modern Lithuania.
May 1 » German troops enter Munich to suppress the Bavarian Soviet Republic.
June 15 » John Alcock and Arthur Brown complete the first nonstop transatlantic flight when they reach Clifden, County Galway, Ireland.
September 10 » Austria and the Allies sign the Treaty of Saint-Germain-en-Laye recognizing the independence of Poland, Hungary, Czechoslovakia and Yugoslavia.
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/I136334.php : accessed February 8, 2026), "Henderika Arkema (1898-????)".
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