Markets I suppose.

GTA V has a prominent role playing community that is made up of all ethnicities, one of them being what you seek. Theyve developed quite a robust community there which seeks to mimic lifestyles found in US urban areas.

Have you heard of a place called "worldstarhiphop"?

Just do a search in the steam groups, I am sure you can find something. Really Steam doesn't have cohesive groups of anything, and it is hard enough to find people dedicated to playing games, let alone social groups.