On September 23, 1905, negotiations on the Karlstad Treaty ended with an agreement to split the union of Sweden and Norway. The accord was then approved by Norway’s parliament on October 9 and by Sweden’s on October 13. Learn more about the former Union of Sweden and Norway.

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On September 23, 1901, Leon Czolgosz was put on trial for assassinating US President William McKinley at the Pan-American Exposition in Buffalo, New York. Learn more about the legal aftermath of the McKinley assassination from the University of Buffalo Libraries.

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On September 22, 1896, Queen Victoria became the longest-reigning monarch in English history. One of the country’s most successful rulers, Victoria oversaw the expansion of the British Empire to its greatest height of power during her reign of 63 years and 7 months. Read Victoria’s speeches to the British Parliament from Archive.org.

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On September 21, 1972, President Ferdinand Marcos signed Proclamation 1081, implementing martial law in the Philippines. Marcos used the proclamation not only to suppress a communist insurgency but to eliminate political opponents as well. He remained in power until he was forced from office and into exile by the People Power Revolution in 1986.

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On September 20, 1633, the Roman Catholic Church tried Galileo Galilei on charges of heresy. Galileo was brought before the Congregation for the Doctrine of Faith for his assertion that the Earth orbits the Sun. He was sentenced to spend the rest of his life under house arrest. Read documents from the trial of Galileo.

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