On August 19, 1791, the accomplished American mathematician
and astronomer Benjamin Banneker wrote a letter to then-
Secretary of State Thomas Jefferson.

Jefferson corresponded prolifically with luminaries from around
the world, but Banneker is unique among them: the son of a free
Black American woman and a formerly enslaved African man from Guinea, Banneker criticizes Jefferson’s hypocritical stance on
slavery in respectful but unambiguous terms, using Jefferson’s
own words to make his case for the abolition of slavery.

Banneker himself was born free in what is now Ellicott City,
Maryland, and was encouraged in his studies of astronomy
and mathematics by the Ellicotts, a Quaker family who owned
a mill and much of the land in the area.