January 31 » Czechoslav Trade Union Association is founded in Prague.
February 28 » Queen Ranavalona III, the last monarch of Madagascar, is deposed by a French military force.
April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
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.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
September 1 » The Tremont Street Subway in Boston opens, becoming the first underground rapid transit system in North America.
Day of marriage May 19, 1917
The temperature on May 19, 1917 was between 11.0 °C and 20.6 °C and averaged 15.4 °C. There was 0.3 mm of rain. There was 3.4 hours of sunshine (21%). The average windspeed was 2 Bft (weak wind) and was prevailing from the ??. Source: KNMI
In The Netherlands , there was from August 29, 1913 to September 9, 1918 the cabinet Cort van der Linden, with Mr. P.W.A. Cort van der Linden (liberaal) as prime minister.
June 26 » World War I: The American Expeditionary Forces begin to arrive in France. They will first enter combat four months later.
July 28 » The Silent Parade took place in New York City, in protest to murders, lynchings, and other violence directed towards African Americans.
November 7 » The Gregorian calendar date of the October Revolution, which gets its name from the Julian calendar date of 25 October. On this date in 1917, the Bolsheviks storm the Winter Palace.
December 7 » World War I: The United States declares war on Austria-Hungary.
December 9 » World War I: Field Marshal Allenby captures Jerusalem, Palestine.
December 20 » Cheka, the first Soviet secret police force, is founded.
Day of death April 8, 1957
The temperature on April 8, 1957 was between 1.1 °C and 9.8 °C and averaged 5.9 °C. There was 12.0 hours of sunshine (90%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
January 31 » Eight people (5 total crew from 2 aircraft and 3 on the ground) in Pacoima, California are killed following the mid-air collision between a Douglas DC-7 airliner and a Northrop F-89 Scorpion fighter jet.
May 15 » At Malden Island in the Pacific Ocean, Britain tests its first hydrogen bomb in Operation Grapple.
May 22 » South Africa's government approves of racial separation in universities.
August 1 » The United States and Canada form the North American Aerospace Defense Command (NORAD).
September 24 » President Eisenhower sends the 101st Airborne Division to Little Rock, Arkansas, to enforce desegregation.
October 22 » Vietnam War: First United States casualties in Vietnam.
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/I21031.php : accessed October 13, 2026), "Hermanus Steensma (1897-1957)".
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