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I think the reason you don't see as many negroids racing professionally is because of the cost of entry. They can purchase a basketball or football easily from a sporting goods store or department store. If they get on to their highschool and/or college team they get exposure as well as most equipment for free.
Now imagine being poor and having the whole world against you trying to get into cycling. Maybe they can afford a BSO from a department store but there's no chance they will ever be able to get to an elite level of skill and fitness on that.