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- Operation Northwoods Proposed (1962) (source: Thefreedictionary)
- The Truman Doctrine (1947) (source: Thefreedictionary)
- More events from This Day in History: Mar 13 (source: Infoplease)
- cotton gin: machine designed to extract seeds from cotton was patented by Eli Whitney, contributing greatly to the economic development of the South (1794) (source: Answers)
- Mar 13, 1781: The German-born English astronomer Sir William Herschel discovered the planet Georgium Sidus, later known as Uranus. (source: Infoplease)
