[I do not regard] Black as merely a color of skin pigmentation, but as a heritage, an experience, a cultural and personal identity, the meaning of which becomes specifically stigmatic and/or glorious and/or ordinary under specific social conditions. It is as much socially created as, and at least in the American context no less specifically meaningful or definitive than, any linguistic, tribal, or religious ethnicity, all of which are conventionally recognized by capitalization.
Catharine A. MacKinnon, Feminism, Marxism, Method, and the State: An Agenda for Theory, 7 SIGNS 515, 516 n.* (1982).
Of course, whether MacKinnon lives up to her stated ideals is far more controversial. See Angela Harris, Race and Essentialism in Feminist Legal Theory, 42 STAN. L. REV. 581, 590-601 (1990).