January 2 » American statesman and diplomat John Hay announces the Open Door Policy to promote trade with China.
May 17 » The children's novel The Wonderful Wizard of Oz, by L. Frank Baum, is first published in the United States. The first copy is given to the author's sister.
May 29 » N'Djamena is founded as Fort-Lamy by the French commander Émile Gentil.
June 20 » Boxer Rebellion: The Imperial Chinese Army begins a 55-day siege of the Legation Quarter in Beijing, China.
July 2 » The first Zeppelin flight takes place on Lake Constance near Friedrichshafen, Germany.
August 14 » The Eight-Nation Alliance occupies Beijing, China, in a campaign to end the bloody Boxer Rebellion in China.
When copying data from this family tree, please include a reference to the origin: Jo Consten, "Family tree Consten Koolen", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-consten-koolen/I491.php : accessed February 26, 2026), "Hendrika van den Bogaart (1900-)".
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