#OnThisDay in 1973 [en.wikipedia.org] – A year after the completion of the second of the complex's twin towers, the World Trade Center in New York City was officially dedicated.
#OnThisDay in 2012 [en.wikipedia.org] – A gunman shot at people inside Oikos University, a Korean Christian college in Oakland, California, leaving seven people dead and three injured.
#OnThisDay in 2004 [en.wikipedia.org] – The Old National Library Building in Singapore was closed to make way for a tunnel, despite widespread protests.
#OnThisDay in 2009 [en.wikipedia.org] – The Manawan Police Academy in Lahore, Pakistan, was attacked and held for several hours by 12 gunmen, resulting in 16 deaths and 95 injuries.
#OnThisDay in 1882 [en.wikipedia.org] – The Knights of Columbus, the world's largest Catholic fraternal service organization, was founded by Michael J. McGivney in New Haven, Connecticut, U.S.
#OnThisDay in 1998 [en.wikipedia.org] – The U.S. Food and Drug Administration approved the drug sildenafil (chemical structure pictured), better known by the trade name Viagra, for use as a treatment for erectile dysfunction, the…
#OnThisDay in 1999 [en.wikipedia.org] – A jury began deliberations in the trial of Jack Kevorkian, an American practitioner of physician-assisted suicide who was charged with murder in the death of a terminally ill patient.
#OnThisDay in 1949 [en.wikipedia.org] – The Soviet Union began mass deportations of more than 90,000 "undesirable" people from the Baltic states to Siberia.
#OnThisDay in 1939 [en.wikipedia.org] – Members of the German National Movement in Liechtenstein attempted to overthrow the government and provoke Liechtenstein's annexation into Nazi Germany.
#OnThisDay in 1638 [en.wikipedia.org] – Anne Hutchinson was expelled from the Massachusetts Bay Colony for her participation in the Antinomian Controversy.
#OnThisDay in 1944 [en.wikipedia.org] – World War II: U.S. Marines made a landing on Emirau Island in the Bismarck Archipelago to develop an airbase as part of Operation Cartwheel.
#OnThisDay in 1279 [en.wikipedia.org] – Mongol conquest of Song China: Zhao Bing , the last emperor of the Song dynasty, drowned at the end of the Battle of Yamen, bringing the dynasty to an end after three centuries.