March 14 » The Gold Standard Act is ratified, placing the United States currency on the gold standard.
April 2 » The United States Congress passes the Foraker Act, giving Puerto Rico limited self-rule.
May 18 » The United Kingdom proclaims a protectorate over Tonga.
June 14 » Hawaii becomes a United States territory.
June 17 » Boxer Rebellion: Western Allied and Japanese forces capture the Taku Forts in Tianjin, China.
November 7 » The People's Party is founded in Cuba.
Day of marriage May 13, 1931
The temperature on May 13, 1931 was between 10.7 °C and 22.9 °C and averaged 16.5 °C. There was 0.1 mm of rain during 0.1 hours. There was 10.4 hours of sunshine (67%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the south. 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 21 » Sir Isaac Isaacs is sworn in as the first Australian-born Governor-General of Australia.
March 5 » The British Raj: Gandhi–Irwin Pact is signed.
May 7 » The stand-off between criminal Francis Crowley and 300 members of the New York Police Department takes place in his fifth-floor apartment on West 91st Street, New York City.
July 1 » United Airlines begins service (as Boeing Air Transport).
October 1 » The George Washington Bridge in the United States, linking New Jersey and New York, is opened.
October 17 » Al Capone is convicted of income tax evasion.
Day of death February 21, 1958
The temperature on February 21, 1958 was between 1.0 °C and 6.7 °C and averaged 3.7 °C. There was 2.7 mm of rain during 7.1 hours. There was 0.6 hours of sunshine (6%). The heavily clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west-northwest. Source: KNMI
March 26 » The African Regroupment Party is launched at a meeting in Paris.
May 13 » During a visit to Caracas, Venezuela, Vice President Richard Nixon's car is attacked by anti-American demonstrators.
August 23 » Chinese Civil War: The Second Taiwan Strait Crisis begins with the People's Liberation Army's bombardment of Quemoy.
October 7 » The U.S. manned space-flight project is renamed Project Mercury.
October 27 » Iskander Mirza, the first President of Pakistan, is deposed by General Ayub Khan, who had been appointed the enforcer of martial law by Mirza 20 days earlier.
December 5 » The Preston By-pass, the UK's first stretch of motorway, opens to traffic for the first time. (It is now part of the M6 and M55 motorways.)
When copying data from this family tree, please include a reference to the origin: Hendrik de Graaf, "Family tree Plugboer", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-plugboer/I6716.php : accessed February 4, 2026), "Klaas den Hartigh (1900-1958)".
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