June 16 » A treaty annexing the Republic of Hawaii to the United States is signed; the Republic would not be dissolved until a year later.
July 11 » Salomon August Andrée leaves Spitsbergen to attempt to reach the North Pole by balloon. He later crashes and dies.
August 10 » German chemist Felix Hoffmann discovers an improved way of synthesizing acetylsalicylic acid (aspirin).
August 31 » Thomas Edison patents the Kinetoscope, the first movie projector.
September 10 » Lattimer massacre: A sheriff's posse kills 19 unarmed striking immigrant miners in Lattimer, Pennsylvania, United States.
November 1 » The first Library of Congress building opens its doors to the public; the library had previously been housed in the Congressional Reading Room in the U.S. Capitol.
Day of death April 21, 1945
The temperature on April 21, 1945 was between 6.8 °C and 13.3 °C and averaged 9.9 °C. Source: KNMI
In The Netherlands , there was from July 27, 1941 to February 23, 1945 the cabinet Gerbrandy II, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
In The Netherlands , there was from February 23, 1945 to June 24, 1945 the cabinet Gerbrandy III, with Prof. dr. P.S. Gerbrandy (ARP) as prime minister.
From June 24, 1945 till July 3, 1946 the Netherlands had a cabinet Schermerhorn - Drees with the prime ministers Prof. ir. W. Schermerhorn (VDB) and W. Drees (PvdA).
January 1 » World War II: The German Luftwaffe launches Operation Bodenplatte, a massive, but failed attempt to knock out Allied air power in northern Europe in a single blow.
April 4 » World War II: American troops liberate Ohrdruf forced labor camp in Germany.
April 6 » World War II: The Battle of Slater's Knoll on Bougainville comes to an end.
April 9 » World War II: The German heavy cruiser Admiral Scheer is sunk by the Royal Air Force.
April 29 » World War II: The Surrender of Caserta is signed by the commander of German forces in Italy.
July 16 » Manhattan Project: The Atomic Age begins when the United States successfully detonates a plutonium-based test nuclear weapon near Alamogordo, New Mexico.
When copying data from this family tree, please include a reference to the origin: Martin Brederoo, "Genealogy Brederoo", database, Genealogy Online (https://www.genealogieonline.nl/test-brederoo/I1133.php : accessed January 22, 2026), "Harm Werkman (1897-1945)".
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