He made the 1st clock in the USA................redrew the street map of Wash DC...............from scratch...............they put DC's corner stone at Jones point in Alexandria b/c of him..........with his knowledge of astronomy and math.............he calculated where it should be put..............

Benjamin Banneker - Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Benjamin_Banneker

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Benjamin Banneker (November 9, 1731 – October 9, 1806) was a free African American almanac author, surveyor, naturalist and farmer. Born in Baltimore County, Maryland, to a free African American woman and a former slave, Banneker had little formal education and was largely self-taught.

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