January 17 » El Yunque National Forest in Puerto Rico becomes part of the United States National Forest System as the Luquillo Forest Reserve.
February 23 » Cuba leases Guantánamo Bay to the United States "in perpetuity".
March 14 » Pelican Island National Wildlife Refuge, the first national wildlife refuge in the US, is established by President Theodore Roosevelt.
May 29 » In the May Coup, Alexander I, King of Serbia, and Queen Draga, are assassinated in Belgrade by the Black Hand (Crna Ruka) organization.
October 1 » Baseball: The Boston Americans play the Pittsburgh Pirates in the first game of the modern World Series.
November 3 » With the encouragement of the United States, Panama separates from Colombia.
Day of marriage April 22, 1927
The temperature on April 22, 1927 was between 7.9 °C and 12.6 °C and averaged 10.3 °C. There was 2.0 hours of sunshine (14%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the west-southwest. Source: KNMI
February 23 » German theoretical physicist Werner Heisenberg writes a letter to fellow physicist Wolfgang Pauli, in which he describes his uncertainty principle for the first time.
March 11 » In New York City, Samuel Roxy Rothafel opens the Roxy Theatre.
April 27 » Carabineros de Chile (Chilean national police force and gendarmerie) are created.
May 4 » The Academy of Motion Picture Arts and Sciences is incorporated.
September 30 » Babe Ruth becomes the first baseball player to hit 60 home runs in a season.
December 30 » The Ginza Line, the first subway line in Asia, opens in Tokyo, Japan.
When copying data from this family tree, please include a reference to the origin: Jan Kaper, "Family tree Kaper", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kaper/I74490.php : accessed February 27, 2026), "Rijnko Havinga (1903-)".
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