January 28 » The Carnegie Institution of Washington is founded in Washington, D.C. with a $10 million gift from Andrew Carnegie.
April 18 » The 7.5 Mw Guatemala earthquake shakes Guatemala with a maximum Mercalli intensity of VIII (Severe), killing between 800–2,000.
May 31 » Second Boer War: The Treaty of Vereeniging ends the war and ensures British control of South Africa.
July 17 » Willis Carrier creates the first air conditioner in Buffalo, New York.
August 22 » Cadillac Motor Company is founded.
December 10 » The opening of the reservoir of the Aswan Dam in Egypt.
Day of death September 12, 1956
The temperature on September 12, 1956 was between 10.6 °C and 15.1 °C and averaged 13.0 °C. There was 0.5 hours of sunshine (4%). The heavily clouded was. The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
March 1 » Formation of the East German Nationale Volksarmee.
May 1 » The polio vaccine developed by Jonas Salk is made available to the public.
July 30 » A joint resolution of the U.S. Congress is signed by President Dwight D. Eisenhower, authorizing In God We Trust as the U.S. national motto.
October 28 » Elvis Presley receives a polio vaccination on national TV.
October 29 » Suez Crisis begins: Israeli forces invade the Sinai Peninsula and push Egyptian forces back toward the Suez Canal.
October 31 » Hungarian Revolution of 1956: A Revolutionary Headquarters is established in Hungary. Following Imre Nagy's announcement of October 30, banned non-Communist political parties are reformed, and the MDP is replaced by the MSZMP. József Mindszenty is released from prison. The Soviet Politburo makes the decision to crush the Revolution.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I136960.php : accessed October 18, 2026), "Martinus van der Kooy (1902-1956)".
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