March 20 » Prime Minister of the German Empire Otto von Bismarck is dismissed by Emperor Wilhelm II.
April 14 » The Pan-American Union is founded by the First International Conference of American States in Washington, D.C.
June 1 » The United States Census Bureau begins using Herman Hollerith's tabulating machine to count census returns.
July 27 » Vincent van Gogh shoots himself and dies two days later.
August 7 » Anna Månsdotter became the last woman to be executed in Sweden for the 1889 Yngsjö murder.
October 1 » Yosemite National Park is established by the U.S. Congress.
Day of marriage February 25, 1915
The temperature on February 25, 1915 was between -1.8 °C and 7.0 °C and averaged 1.6 °C. There was 0.2 mm of rain. There was 9.0 hours of sunshine (85%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northwest. 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.
January 19 » Georges Claude patents the neon discharge tube for use in advertising.
January 25 » Alexander Graham Bell inaugurates U.S. transcontinental telephone service, speaking from New York to Thomas Watson in San Francisco.
January 26 » The Rocky Mountain National Park is established by an act of the U.S. Congress.
March 20 » Albert Einstein publishes his general theory of relativity.
July 7 » The First Battle of the Isonzo comes to an end.
August 17 » A Category 4 hurricane hits Galveston, Texas with winds at 135 miles per hour (217km/h).
Day of death May 11, 1971
The temperature on May 11, 1971 was between 8.6 °C and 25.0 °C and averaged 17.7 °C. There was -0.1 mm of rain. There was 13.6 hours of sunshine (88%). The average windspeed was 1 Bft (weak wind) and was prevailing from the east-northeast. Source: KNMI
January 1 » Cigarette advertisements are banned on American television.
February 24 » The All India Forward Bloc holds an emergency central committee meeting after its chairman, Hemantha Kumar Bose, is killed three days earlier. P.K. Mookiah Thevar is appointed as the new chairman.
March 8 » The Fight of the Century between Joe Frazier and Muhammad Ali commences. Frazier wins in 15 rounds via unanimous decision.
July 11 » Copper mines in Chile are nationalized.
November 23 » Representatives of the People's Republic of China attend the United Nations, including the United Nations Security Council, for the first time.
December 4 » The PNS Ghazi, a submarine belonging to the Pakistan Navy, sinks during the course of the Indo-Pakistani Naval War of 1971.
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I1468.php : accessed February 16, 2026), "Jan Ambrosius Zwankhuizen (1890-1971)".
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