April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
May 26 » The original manuscript of William Bradford's history, "Of Plymouth Plantation" is returned to the Governor of Massachusetts by the Bishop of London after being taken during the American Revolutionary War.
August 21 » Oldsmobile, an American automobile manufacturer and marque, is founded.
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
September 11 » After months of pursuit, generals of Menelik II of Ethiopia capture Gaki Sherocho, the last king of Kaffa, bringing an end to that ancient kingdom.
Day of marriage August 17, 1921
The temperature on August 17, 1921 was between 12.6 °C and 24.3 °C and averaged 18.8 °C. There was 6.0 hours of sunshine (41%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south east. 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 17 » The Second Polish Republic adopts the March Constitution.
March 18 » The Kronstadt rebellion is suppressed by the Red Army.
March 31 » The Royal Australian Air Force is formed.
July 29 » Adolf Hitler becomes leader of the National Socialist German Workers Party.
August 28 » The Red Army dissolved the Free Territory, after driving the Black Army out of Ukraine.
October 13 » Soviet republics sign the Treaty of Kars to formalize the borders between Turkey and the South Caucasus states.
Day of death December 16, 1950
The temperature on December 16, 1950 was between -4.7 °C and 2.5 °C and averaged -0.7 °C. There was 0.5 mm of rain during 1.8 hours. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
January 17 » United Nations Security Council Resolution 79 relating to arms control is adopted.
June 1 » The Chinchaga fire ignites. By September, it would become the largest single fire on record in North America.
July 20 » Cold War: In Philadelphia, Harry Gold pleads guilty to spying for the Soviet Union by passing secrets from atomic scientist Klaus Fuchs.
September 24 » The eastern United States is covered by a thick haze from the Chinchaga fire in western Canada.
October 11 » CBS's field-sequential color system for television is the first to be licensed for broadcast by the U.S. Federal Communications Commission.
October 16 » The Lion, the Witch and the Wardrobe by C.S. Lewis is published.
When copying data from this family tree, please include a reference to the origin: E.A. Harmsen, "Family tree Harmsen-de Vries", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-harmsen-de-vries/I81594.php : accessed December 24, 2025), "Alphonsus Aloijsius Sens (1897-1950)".
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