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 21 » Six hundred American school teachers, Thomasites, arrived in Manila on the USAT Thomas.
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.
September 28 » Philippine–American War: Filipino guerrillas kill more than forty American soldiers while losing 28 of their own.
Day of marriage March 21, 1928
The temperature on March 21, 1928 was between -1.6 °C and 5.7 °C and averaged 2.1 °C. There was 6.5 hours of sunshine (53%). The average windspeed was 5 Bft (very strong wind) and was prevailing from the east-southeast. Source: KNMI
April 14 » The Bremen, a German Junkers W 33 type aircraft, reaches Greenly Island, Canada - the first successful transatlantic aeroplane flight from east to west.
July 7 » Sliced bread is sold for the first time (on the inventor's 48th birthday) by the Chillicothe Baking Company of Chillicothe, Missouri.
September 27 » The Republic of China is recognized by the United States.
October 1 » The Soviet Union introduces its first five-year plan.
October 10 » Chiang Kai-shek becomes Chairman of the Republic of China.
October 22 » Phi Sigma Alpha fraternity is founded at the University of Puerto Rico.
Day of death December 13, 1972
The temperature on December 13, 1972 was between 6.5 °C and 10.7 °C and averaged 9.6 °C. There was 0.5 mm of rain during 1.0 hours. The almost completely overcast was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the south-southwest. Source: KNMI
In The Netherlands , there was from April 5, 1967 to Tuesday, July 6, 1971 the cabinet Biesheuvel I, with Mr. B.W. Biesheuvel (ARP) as prime minister.
In The Netherlands , there was from Thursday, July 20, 1972 to Friday, May 11, 1973 the cabinet Biesheuvel II, with Mr. B.W. Biesheuvel (ARP) as prime minister.
January 8 » Bowing to international pressure, President of Pakistan Zulfikar Ali Bhutto releases Bengali leader Sheikh Mujibur Rahman from prison, who had been arrested after declaring the independence of Bangladesh.
April 16 » Apollo program: The launch of Apollo 16 from Cape Canaveral, Florida.
August 11 » Vietnam War: The last United States ground combat unit leaves South Vietnam.
November 8 » American pay television network Home Box Office (HBO) launches, initially transmitting to 365 Teleservice Cable subscribers in Wilkes-Barre, Pennsylvania. First operating as a Northeastern U.S.-based regional service, HBO was one of the first cable-originated television channels. HBO's inaugural programming that evening consisted of its first event telecast—an NHL hockey game between the New York Rangers and the Vancouver Canucks, and its first movie presentation—the 1971 Paul Newman–Henry Fonda film Sometimes a Great Notion.
December 11 » Apollo 17 becomes the sixth and final Apollo mission to land on the Moon.
December 13 » Apollo program: Eugene Cernan and Harrison Schmitt begin the third and final extra-vehicular activity (EVA) or "Moonwalk" of Apollo 17. To date they are the last humans to set foot on the Moon.
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/I44281.php : accessed February 6, 2026), "Sietske de Boer (1901-1972)".
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