1122-Concordat of Worms is agreed between Pope Calixtus II and Holy Roman Emperor Henry V 1821-Fall of Tripolitsa: Greek forces massacre 6,000 to 15,000 Muslim and Jewish civilians 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, beginning the era 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 after a white mob forces them to withdraw 2018-Indian Prime Minister Narendra Modi launches "Modicare," a free healthcare program for 500 million people, the world's largest healthcare initiative