April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
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.
December 30 » The British Colony of Natal annexes Zululand.
Day of marriage January 20, 1921
The temperature on January 20, 1921 was between 1.4 °C and 9.0 °C and averaged 6.4 °C. There was 0.2 mm of rain. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west. 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.
February 22 » After Russian forces under Baron Roman von Ungern-Sternberg drive the Chinese out, the Bogd Khan is reinstalled as the emperor of Mongolia.
February 27 » The International Working Union of Socialist Parties is founded in Vienna.
April 2 » The Autonomous Government of Khorasan, a military government encompassing the modern state of Iran, is established.
August 14 » Tannu Uriankhai, later Tuvan People's Republic is established as a completely independent country (which is supported by Soviet Russia).
September 11 » Nahalal, the first moshav in Palestine, is settled as part of a Zionist plan of creating a Jewish state, later to be Israel.
November 4 » Japanese Prime Minister Hara Takashi is assassinated in Tokyo.
Day of death February 16, 1970
The temperature on February 16, 1970 was between -6.2 °C and 1.4 °C and averaged -1.5 °C. There was 9.6 mm of rain during 5.6 hours. There was 1.5 hours of sunshine (15%). The partly or heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
April 24 » China launches Dong Fang Hong I, becoming the fifth nation to put an object into orbit using its own booster.
September 5 » Jochen Rindt becomes the only driver to posthumously win the Formula One World Drivers' Championship (in 1970), after being killed in practice for the Italian Grand Prix.
October 2 » An aircraft carrying the Wichita State University football team, administrators, and supporters crashes in Colorado, killing 31 people.
October 10 » Fiji becomes independent.
November 5 » The Military Assistance Command, Vietnam reports the lowest weekly American soldier death toll in five years (24).
November 12 » The Oregon Highway Division attempts to destroy a rotting beached Sperm whale with explosives, leading to the now infamous "exploding whale" incident.
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/I108876.php : accessed October 17, 2026), "Hepke Poelstra (1897-1970)".
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