The temperature on December 21, 1910 was between 4.9 °C and 8.6 °C and averaged 7.1 °C. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
April 29 » The Parliament of the United Kingdom passes the People's Budget, the first budget in British history with the expressed intent of redistributing wealth among the British public.
May 11 » An act of the U.S. Congress establishes Glacier National Park in Montana.
June 25 » The United States Congress passes the Mann Act, which prohibits interstate transport of women or girls for “immoral purposes”; the ambiguous language would be used to selectively prosecute people for years to come.
July 4 » The Johnson–Jeffries riots occur after African-American boxer Jack Johnson knocks out white boxer Jim Jeffries in the 15th round. Between 11 and 26 people are killed and hundreds more injured.
September 12 » Premiere performance of Gustav Mahler's Symphony No. 8 in Munich (with a chorus of 852 singers and an orchestra of 171 players. Mahler's rehearsal assistant conductor was Bruno Walter).
November 7 » The first air freight shipment (from Dayton, Ohio, to Columbus, Ohio) is undertaken by the Wright brothers and department store owner Max Moorehouse.
Day of death May 20, 1971
The temperature on May 20, 1971 was between 8.4 °C and 17.8 °C and averaged 12.8 °C. There was 12.5 hours of sunshine (79%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
January 12 » The Harrisburg Seven: Rev. Philip Berrigan and five other activists are indicted on charges of conspiring to kidnap Henry Kissinger and of plotting to blow up the heating tunnels of federal buildings in Washington, D.C.
February 21 » The Convention on Psychotropic Substances is signed at Vienna.
June 7 » The United States Supreme Court overturns the conviction of Paul Cohen for disturbing the peace, setting the precedent that vulgar writing is protected under the First Amendment to the United States Constitution.
October 21 » A gas explosion kills 22 people at a shopping centre near Glasgow, Scotland.
December 3 » Indo-Pakistani War of 1971: Pakistan launches a pre-emptive strike against India and a full-scale war begins.
December 4 » The Indian Navy attacks the Pakistan Navy and Karachi.
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/I4626.php : accessed February 6, 2026), "Hendrik van der Plaat (1910-1971)".
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