1122-Concordat of Worms is agreed between Pope Calixtus II and Holy Roman Emperor Henry V

1821-Fall of Tripolitsa, Greek forces massacre 30,000 Turks during the Greek War of Independence

1862-Otto von Bismarck is appointed Prime Minister and Foreign Minister of Prussia by King Wilhelm I

1884-American Herman Hollerith patents his mechanical tabulating machine, the beginning of data processing

1957-President Dwight D. Eisenhower orders U.S. troops to support the integration of nine Black students at Little Rock Central High School in Arkansas

1986-Congress selects the rose as the U.S. national flower

2018-Indian Prime Minister Narendra Modi launches "Modicare," a free healthcare program for 500 million people, the world's largest healthcare initiative