June 17 » The College Board introduces its first standardized test, the forerunner to the SAT.
August 6 » Kiowa land in Oklahoma is opened for white settlement, effectively dissolving the contiguous reservation.
August 14 » The first claimed powered flight, by Gustave Whitehead in his Number 21.
September 2 » Vice President of the United States Theodore Roosevelt utters the famous phrase, "Speak softly and carry a big stick" at the Minnesota State Fair.
September 6 » Leon Czolgosz, an unemployed anarchist, shoots and fatally wounds US President William McKinley at the Pan-American Exposition in Buffalo, New York.
December 12 » Guglielmo Marconi receives the first transatlantic radio signal (the letter "S" [***] in Morse Code), at Signal Hill in St John's, Newfoundland.
Day of marriage June 11, 1921
The temperature on June 11, 1921 was between 7.6 °C and 17.3 °C and averaged 12.6 °C. There was 6.5 hours of sunshine (39%). 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.
When copying data from this family tree, please include a reference to the origin: Joop Klavers, "Family tree Klavers", database, Genealogy Online (https://www.genealogieonline.nl/stamboom_klavers/I338656.php : accessed February 24, 2026), "Euphemia Elizabeth Walda (1901-)".
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