"1968 would be the year in which "Negroes" became "blacks." In 1965, Stokely Carmichael, an organizer for the remarkably energetic and creative civil rights group the Student Nonviolent Coordinating Committee, or SNCC, invented the name Black Panthers, soon followed by the phrase Black Power. At the time black, in this sense, was a rarely used poetic turn of phrase. The word started out in 1968 as a term for black militants, and by the end of the year it became the preferred term for the people. Negro became a pejorative applied to those who would not stand up for themselves."
January 1, 1970
https://en.wikiquote.org/wiki/Black_people