January 17 » The United States takes possession of Wake Island in the Pacific Ocean.
January 19 » Anglo-Egyptian Sudan is formed.
February 4 » The Philippine–American War begins with the Battle of Manila.
March 31 » Malolos, capital of the First Philippine Republic, is captured by American forces.
May 8 » The Irish Literary Theatre in Dublin produced its first play.
December 2 » Philippine–American War: The Battle of Tirad Pass, termed "The Filipino Thermopylae", is fought.
Day of death June 15, 1980
The temperature on June 15, 1980 was between 12.3 °C and 22.1 °C and averaged 16.6 °C. There was 4.7 mm of rain during 0.5 hours. There was 6.3 hours of sunshine (38%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the southwest. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
March 23 » Archbishop Óscar Romero of El Salvador gives his famous speech appealing to men of the El Salvadoran armed forces to stop killing the Salvadorans.
May 18 » Students in Gwangju, South Korea begin demonstrations calling for democratic reforms.
May 27 » The Gwangju Massacre: Airborne and army troops of South Korea retake the city of Gwangju from civil militias, killing at least 207 and possibly many more.
October 30 » El Salvador and Honduras agree to put the border dispute fought over in 1969's Football War before the International Court of Justice.
December 1 » Ecatepec, State of Mexico, Mexico, becomes a city.
December 24 » Witnesses report the first of several sightings of unexplained lights near RAF Woodbridge, in Rendlesham Forest, Suffolk, England, United Kingdom, an incident called "Britain's Roswell".
When copying data from this family tree, please include a reference to the origin: Dirk Kalksma, "Family tree Kalksma", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-kalksma/I712.php : accessed March 14, 2026), "Siemon Visser (1899-1980)".
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