June 27 » The first solo circumnavigation of the globe is completed by Joshua Slocum from Briar Island, Nova Scotia.
August 11 » Spanish–American War: American troops enter the city of Mayagüez, Puerto Rico.
September 2 » Battle of Omdurman: British and Egyptian troops defeat Sudanese tribesmen and establish British dominance in Sudan.
September 13 » Hannibal Goodwin patents celluloid photographic film.
September 21 » Empress Dowager Cixi seizes power and ends the Hundred Days' Reform in China.
December 26 » Marie and Pierre Curie announce the isolation of radium.
Day of marriage September 1, 1920
The temperature on September 1, 1920 was between 11.0 °C and 16.7 °C and averaged 13.7 °C. There was 5.0 mm of rain. There was -0.1 hours of sunshine (0%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northwest. 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.
May 5 » Authorities arrest Nicola Sacco and Bartolomeo Vanzetti for alleged robbery and murder.
June 4 » Hungary loses 71% of its territory and 63% of its population when the Treaty of Trianon is signed in Paris.
August 15 » Polish–Soviet War: Battle of Warsaw, so-called Miracle at the Vistula.
August 20 » The first commercial radio station, 8MK (now WWJ), begins operations in Detroit.
November 21 » Irish War of Independence: In Dublin, 31 people are killed in what became known as "Bloody Sunday".
Day of death May 12, 1927
The temperature on May 12, 1927 was between 1.8 °C and 11.9 °C and averaged 6.7 °C. There was 2.2 mm of rain. There was 0.8 hours of sunshine (5%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
January 27 » Ibn Saud takes the title of King of Nejd.
April 30 » The Federal Industrial Institute for Women opens in Alderson, West Virginia, as the first women's federal prison in the United States.
May 1 » The Union Labor Life Insurance Company is founded by the American Federation of Labor.
May 18 » After being founded for 20 years, the Government of the Republic of China approves Tongji University to be among the first national universities of the Republic of China.
July 23 » The first station of the Indian Broadcasting Company goes on the air in Bombay.
November 21 » Columbine Mine massacre: Striking coal miners are allegedly attacked with machine guns by a detachment of state police dressed in civilian clothes.
When copying data from this family tree, please include a reference to the origin: Michas Bertou, "Family tree Bertou", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-bertou/I423.php : accessed February 12, 2026), "Helena "Lena" Bertou (1898-1927)".
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