Black American swim team members-
Conor Dwyer and Cullen Jones on the U.S. team at the Olympics, I believe Anthony Irwin also is on the team (Black-Indian). Dwyer was part of the gold medal 4x200 freestyle relay team. Cullen Jones is part of the world record 4x100 freestyle relay team (silver medal at these games). He picked up individual silver medals in this Olympics.
Lia Neal made the women's team.

Perhaps they have more interest in the track events.
Dunno the situation in GB.