The US black population is around 13-14%. 18% of the NFL's head coaches are black. Stupid, race baiting question.
Currently 6 teams (Cincinnati, Tampa Bay, Indianapolis, Pittsburgh, Chicago and San Francisco) are the only NFL teams with Black head coaches. Art Shell was the first black head coach in the NFL, coaching for Oakland in two separate tenures. In the history of the NFL, only 10 Black head coaches have been hired.