January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
January 23 » Second Boer War: The Battle of Spion Kop between the forces of the South African Republic and the Orange Free State and British forces ends in a British defeat.
February 9 » The Davis Cup competition is established.
February 27 » Second Boer War: In South Africa, British military leaders receive an unconditional notice of surrender from Boer General Piet Cronjé at the Battle of Paardeberg.
July 9 » The Governor of Shanxi province in North China orders the execution of 45 foreign Christian missionaries and local church members, including children.
December 14 » Quantum mechanics: Max Planck presents a theoretical derivation of his black-body radiation law.
When copying data from this family tree, please include a reference to the origin: Eva Drenth, "Family tree Diverse", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-drenth/I21179.php : accessed January 24, 2026), "Maria Helena Wilhelmina Hartjens (1900-)".
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