Congress created the Oregon Territory, which included Oregon, Washington, Idaho, and Western Montana.
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Mudslides and flooding in Sierra Leone's capital Freetown claimed the lives of 1,141 people and left 3,00 without homes.
The New York Eye Infirmary opened, and it was the first specialty hospital of its kind in the western hemisphere.
Venezuelan political terrorist Carlos the Jackal was captured in Sudan.
A rainbow lasting three hours was recorded over the Gwynedd coast in Wales.
After being in construction for 632 years, the Cologne Cathedral was completed.