May 9 » Australia opens its first national parliament in Melbourne.
August 6 » Kiowa land in Oklahoma is opened for white settlement, effectively dissolving the contiguous reservation.
August 10 » The U.S. Steel recognition strike by the Amalgamated Association of Iron and Steel Workers begins.
September 28 » Philippine–American War: Filipino guerrillas kill more than forty American soldiers while losing 28 of their own.
October 24 » Annie Edson Taylor becomes the first person to go over Niagara Falls in a barrel.
November 18 » Britain and the United States sign the Hay–Pauncefote Treaty, which nullifies the Clayton–Bulwer Treaty and withdraws British objections to an American-controlled canal in Panama.
Day of marriage March 28, 1928
The temperature on March 28, 1928 was between -0.8 °C and 10.7 °C and averaged 5.9 °C. There was 3.4 mm of rain. There was 3.2 hours of sunshine (25%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
March 12 » In California, the St. Francis Dam fails; the resulting floods kill 431 people.
May 3 » The Jinan incident begins with the deaths of twelve Japanese civilians by Chinese forces in Jinan, China, which leads to Japanese retaliation and the deaths of over 2,000 Chinese civilians in the following days.
October 22 » Phi Sigma Alpha fraternity is founded at the University of Puerto Rico.
November 18 » Release of the animated short Steamboat Willie, the first fully synchronized sound cartoon, directed by Walt Disney and Ub Iwerks, featuring the third appearances of cartoon characters Mickey Mouse and Minnie Mouse. This is considered by the Disney corporation to be Mickey's birthday.
November 22 » The premier performance of Ravel's Boléro takes place in Paris.
December 13 » George Gershwin's An American in Paris is first performed.
Day of death December 20, 1956
The temperature on December 20, 1956 was between 3.4 °C and 4.9 °C and averaged 4.0 °C. The almost completely overcast was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the northeast. Source: KNMI
April 19 » Actress Grace Kelly marries Prince Rainier of Monaco.
May 24 » The first Eurovision Song Contest is held in Lugano, Switzerland.
July 26 » Following the World Bank's refusal to fund building the Aswan Dam, Egyptian leader Gamal Abdel Nasser nationalizes the Suez Canal, sparking international condemnation.
October 28 » Hungarian Revolution: A de facto ceasefire comes into effect between armed revolutionaries and Soviet troops, who begin to withdraw from Budapest. Communist officials and facilities come under attack by revolutionaries.
November 1 » The Springhill mining disaster in Springhill, Nova Scotia kills 39 miners; 88 are rescued.
December 28 » Chin Peng, David Marshall and Tunku Abdul Rahman meet in Baling, Malaya to try and resolve the Malayan Emergency situation.
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/I4202.php : accessed March 17, 2026), "Leonardus Andreas Keijsper (1901-1956)".
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