Canterbury Female Boarding School
The Canterbury Female Boarding School, in Canterbury, Connecticut, was operated by its founder, Prudence Crandall, from 1831 to 1834. When townspeople would not allow African-American girls to enroll, Crandall decided to turn it into a school for African-American girls only, the first such in the United States.
Source: Wikipedia — Canterbury Female Boarding School (CC BY-SA 4.0)