February 7 » A Chinese immigrant in San Francisco falls ill to bubonic plague in the first plague epidemic in the continental United States.
February 28 » The Second Boer War: The 118-day "Siege of Ladysmith" is lifted.
May 22 » The Associated Press is formed in New York City as a non-profit news cooperative.
July 19 » The first line of the Paris Métro opens for operation.
September 13 » Filipino insurgents defeat a small American column in the Battle of Pulang Lupa, during the Philippine–American War.
October 19 » Max Planck discovers Planck's law of black-body radiation.
Day of death March 9, 1931
The average temperature on March 9, 1931 was -5.3 °C. There was 7.0 hours of sunshine (62%). The average windspeed was 2 Bft (weak wind) and was prevailing from the north-northeast. Source: KNMI
In The Netherlands , there was from August 10, 1929 to May 26, 1933 the cabinet Ruys de Beerenbrouck III, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 7 » Guy Menzies flies the first solo non-stop trans-Tasman flight (from Australia to New Zealand) in 11 hours and 45 minutes, crash-landing on New Zealand's west coast.
February 3 » The Hawke's Bay earthquake, New Zealand's worst natural disaster, kills 258.
July 16 » Emperor Haile Selassie signs the first constitution of Ethiopia.
October 21 » A secret society in the Imperial Japanese Army launches an abortive coup d'état attempt.
November 7 » The Chinese Soviet Republic is proclaimed on the anniversary of the October Revolution.
December 9 » The Constituent Cortes approves a constitution which establishes the Second Spanish Republic.
When copying data from this family tree, please include a reference to the origin: Arie Verloop, "Family tree Verloop", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-verloop/I4463.php : accessed October 4, 2026), "Jan VERLOOP (1900-1931)".
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