January 1 » The British colonies of New South Wales, Queensland, Victoria, South Australia, Tasmania, and Western Australia federate as the Commonwealth of Australia; Edmund Barton is appointed the first Prime Minister.
May 9 » Australia opens its first national parliament in Melbourne.
June 17 » The College Board introduces its first standardized test, the forerunner to the SAT.
August 21 » Six hundred American school teachers, Thomasites, arrived in Manila on the USAT Thomas.
September 17 » Second Boer War: A Boer column defeats a British force at the Battle of Blood River Poort.
December 3 » In a State of the Union message, U.S. President Theodore Roosevelt delivers a 20,000-word speech to the House of Representatives asking Congress to curb the power of trusts "within reasonable limits".
Day of marriage April 1, 1931
The temperature on April 1, 1931 was between -4.6 °C and 8.5 °C and averaged 2.3 °C. There was 10.5 hours of sunshine (81%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the east-southeast. 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.
March 15 » SSViking explodes off Newfoundland, killing 27 of the 147 on board.
May 1 » The Empire State Building is dedicated in New York City.
September 18 » The Mukden Incident gives Japan a pretext to invade and occupy Manchuria.
October 1 » The George Washington Bridge in the United States, linking New Jersey and New York, is opened.
November 7 » The Chinese Soviet Republic is proclaimed on the anniversary of the October Revolution.
November 22 » Al-Mina'a SC is founded in Iraq.
Day of death April 11, 1981
The temperature on April 11, 1981 was between 9.2 °C and 20.9 °C and averaged 14.8 °C. There was 8.5 hours of sunshine (63%). The partly clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south east. Source: KNMI
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
In The Netherlands , there was from Friday, September 11, 1981 to Saturday, May 29, 1982 the cabinet Van Agt II, with Mr. A.A.M. van Agt (CDA) as prime minister.
April 27 » Xerox PARC introduces the computer mouse.
June 16 » US President Ronald Reagan awards the Congressional Gold Medal to Ken Taylor, Canada's former ambassador to Iran, for helping six Americans escape from Iran during the hostage crisis of 1979–81; he is the first foreign citizen bestowed the honor.
June 28 » A powerful bomb explodes in Tehran, killing 73 officials of the Islamic Republican Party.
August 19 » Gulf of Sidra Incident: United States fighters intercept and shoot down two Libyan Sukhoi Su-22 fighter jets over the Gulf of Sidra.
September 21 » Belize is granted full independence from the United Kingdom.
October 21 » Andreas Papandreou becomes Prime Minister of Greece, ending an almost 50-year-long system of power dominated by conservative forces.
When copying data from this family tree, please include a reference to the origin: Olaf Andersen, "Andersen family tree", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-andersen/I5880.php : accessed March 5, 2026), "Hendrik de Pater (1901-1981)".
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