April 18 » The Greco-Turkish War is declared between Greece and the Ottoman Empire.
April 30 » J. J. Thomson of the Cavendish Laboratory announces his discovery of the electron as a subatomic particle, over 1,800 times smaller than a proton (in the atomic nucleus), at a lecture at the Royal Institution in London.
June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
August 2 » Anglo-Afghan War: The Siege of Malakand ends when a relief column is able to reach the British garrison in the Malakand states.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
Day of death March 20, 1948
The temperature on March 20, 1948 was between 7.3 °C and 12.8 °C and averaged 9.5 °C. There was 0.2 hours of sunshine (2%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
In The Netherlands , there was from July 3, 1946 to August 7, 1948 the cabinet Beel I, with Dr. L.J.M. Beel (KVP) as prime minister.
From August 7, 1948 till March 15, 1951 the Netherlands had a cabinet Drees - Van Schaik with the prime ministers Dr. W. Drees (PvdA) and Mr. J.R.H. van Schaik (KVP).
April 9 » Jorge Eliécer Gaitán's assassination provokes a violent riot in Bogotá (the Bogotazo), and a further ten years of violence in Colombia.
May 26 » The U.S. Congress passes Public Law 80-557, which permanently establishes the Civil Air Patrol as an auxiliary of the United States Air Force.
June 7 » Anti-Jewish riots in Oujda and Jerada take place.
July 26 » U.S. President Harry S. Truman signs Executive Order 9981, desegregating the military of the United States.
September 13 » Margaret Chase Smith is elected United States senator, and becomes the first woman to serve in both the U.S. House of Representatives and the United States Senate.
September 17 » The Nizam of Hyderabad surrenders his sovereignty over the Hyderabad State and joins the Indian Union.
When copying data from this family tree, please include a reference to the origin: Hans Pruckmuller, "Family tree Van Willigen", database, Genealogy Online (https://www.genealogieonline.nl/van-willigen-stamboom/I8016.php : accessed March 4, 2026), "Pieternella van der Vliet (1870-1948)".
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