Why are all the best running backs black?

Yes.

why are all the best swimmers white ?

I know blacks have fast twitch muscles which helps them run faster but what genetic advantages do the white QB's have to make them better at throwing a ball?

Hayden, because blacks have bigger and heavier bones making it more difficult.

also if you are a promising young black athlete you will play in a different position because you are more likely to excel there.

Back in the days of slavery
Ashamedly
White slave owners would take the biggest slaves & make them breed, in the hope they would be stronger workers
Its the reason why most pro athletes in the states are black

Hybrid vigour has alot to do with it.Many black americans have european and native american blood in them.

Its the same as why are all the kickers and punters white?

As for punters Reggie Roby was black and good. Slavery also bred Mandingo warriors who used to fight in organized bouts for their owners.
Yes they were selectively bred.

good topic
is there any white running backs in the nfl

yeahi think they are all at cleveland :( with the only blind quarterback and ever so mentally insane head coach..

why are all the sky presenters black? :0

Forget that, has anyone EVER seen a Chinese funeral?

think about it....