April 21 » Spanish–American War: The United States Navy begins a blockade of Cuban ports. When the U.S. Congress issued a declaration of war on April 25, it declared that a state of war had existed from this date.
April 22 » Spanish–American War: The USSNashville captures a Spanish merchant ship.
June 10 » Spanish–American War: In the Battle of Guantánamo Bay, U.S. Marines begin the American invasion of Spanish-held Cuba.
June 12 » Philippine Declaration of Independence: General Emilio Aguinaldo declares the Philippines' independence from Spain.
August 13 » Carl Gustav Witt discovers 433 Eros, the first near-Earth asteroid to be found.
August 13 » Spanish–American War: Spanish and American forces engage in a mock battle for Manila, after which the Spanish commander surrendered in order to keep the city out of Filipino rebel hands.
Day of marriage March 17, 1921
The temperature on March 17, 1921 was between 2.2 °C and 15.1 °C and averaged 8.5 °C. There was 4.3 hours of sunshine (36%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
March 1 » Following mass protests in Petrograd demanding greater freedom in the RSFSR, the Kronstadt rebellion began, with sailors and citizens taking up arms against the Bolsheviks.
June 12 » Mikhail Tukhachevsky orders the use of chemical weapons against the Tambov Rebellion, bringing an end to the peasant uprising.
July 2 » World War I: U.S. President Warren G. Harding signs the Knox–Porter Resolution formally ending the war between the United States and Germany.
August 14 » Tannu Uriankhai, later Tuvan People's Republic is established as a completely independent country (which is supported by Soviet Russia).
September 5 » Roscoe "Fatty" Arbuckle party in San Francisco ends with the death of the young actress Virginia Rappe: One of the first scandals of the Hollywood community.
October 13 » Soviet republics sign the Treaty of Kars to formalize the borders between Turkey and the South Caucasus states.
Day of death May 13, 1971
The temperature on May 13, 1971 was between 11.2 °C and 21.0 °C and averaged 15.7 °C. There was 8.2 hours of sunshine (53%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northeast. Source: KNMI
February 2 » Idi Amin replaces President Milton Obote as leader of Uganda.
February 21 » The Convention on Psychotropic Substances is signed at Vienna.
June 30 » The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve.
September 20 » Having weakened after making landfall in Nicaragua the previous day, Hurricane Irene regains enough strength to be renamed Hurricane Olivia, making it the first known hurricane to cross from the Atlantic Ocean into the Pacific.
November 12 » Vietnam War: As part of Vietnamization, US President Richard Nixon sets February 1, 1972 as the deadline for the removal of another 45,000 American troops from Vietnam.
December 16 » The United Kingdom recognizes Bahrain's independence, which is commemorated annually as Bahrain's National Day.
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/I10682.php : accessed February 19, 2026), "Koert Koning (1898-1971)".
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