March 2 » In New York City the Martha Washington Hotel opens, becoming the first hotel exclusively for women.
August 29 » The Slava, the last of the five Borodino-class battleships, is launched.
September 11 » The first race at the Milwaukee Mile in West Allis, Wisconsin is held. It is the oldest major speedway in the world.
October 10 » The Women's Social and Political Union is founded in support of the enfranchisement of British women.
November 17 » The Russian Social Democratic Labour Party splits into two groups: The Bolsheviks (Russian for "majority") and Mensheviks (Russian for "minority").
November 18 » The Hay–Bunau-Varilla Treaty is signed by the United States and Panama, giving the United States exclusive rights over the Panama Canal Zone.
Day of marriage May 12, 1928
The temperature on May 12, 1928 was between 2.1 °C and 12.3 °C and averaged 8.3 °C. There was 1.0 mm of rain. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
January 1 » Boris Bazhanov defects through Iran. He is the only assistant of Joseph Stalin's secretariat to have defected from the Eastern Bloc.
June 8 » Second Northern Expedition: The National Revolutionary Army captures Peking, whose name is changed to Beijing ("Northern Capital").
October 2 » The "Prelature of the Holy Cross and the Work of God", commonly known as Opus Dei, is founded.
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.
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/I420172.php : accessed February 22, 2026), "Roelof Jansen (1903-)".
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