January 1 » New York, New York annexes land from surrounding counties, creating the City of Greater New York. The four initial boroughs, Manhattan, Brooklyn, Queens, and The Bronx, are joined on January 25 by Staten Island to create the modern city of five boroughs.
June 11 » The Hundred Days' Reform, a planned movement to reform social, political, and educational institutions in China, is started by the Guangxu Emperor, but is suspended by Empress Dowager Cixi after 104 days. (The failed reform led to the abolition of the Imperial examination in 1905.)
June 21 » The United States captures Guam from Spain. The few warning shots fired by the U.S. naval vessels are misinterpreted as salutes by the Spanish garrison, which was unaware that the two nations were at war.
July 25 » Spanish-American War: The American invasion of Spanish-held Puerto Rico begins, as United States Army troops under General Nelson A. Miles land and secure the port at Guánica.
September 13 » Hannibal Goodwin patents celluloid photographic film.
December 10 » Spanish–American War: The Treaty of Paris is signed, officially ending the conflict.
Day of death January 10, 1900
The temperature on January 10, 1900 was about 4.2 °C. The airpressure was 76 cm mercury. The atmospheric humidity was 90%. Source: KNMI
January 24 » Second Boer War: Boers stop a British attempt to break the Siege of Ladysmith in the Battle of Spion Kop.
February 27 » Fußball-Club Bayern München is founded.
June 25 » The Taoist monk Wang Yuanlu discovers the Dunhuang manuscripts, a cache of ancient texts that are of great historical and religious significance, in the Mogao Caves of Dunhuang, China.
October 19 » Max Planck discovers Planck's law of black-body radiation.
November 7 » Second Boer War: Battle of Leliefontein, a battle during which the Royal Canadian Dragoons win three Victoria Crosses.
December 19 » Hopetoun Blunder: The first Governor-General of Australia John Hope, 7th Earl of Hopetoun, appoints Sir William Lyne premier of the new state of New South Wales, but he is unable to persuade other colonial politicians to join his government and is forced to resign.
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The Family tree Doppenberg publication was prepared by Henk Doppenberg (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Henk Doppenberg, "Family tree Doppenberg", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-doppenberg/I2686.php : accessed January 7, 2026), "Johanna Doppenberg (1898-1900)".
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