Why are black men far superior at boxing?

Jimmy "the Greek" Snyder, was an American sports commentator. He was fired in1976 for saying African Americans were naturally superior athletes at least in part because they had been bred to produce stronger offspring during slavery: I am a history buff and I have read books about the old slaverly days. The plantation owners would have their biggest toughest slave fight the biggest toughest slave on the next plantation. They made big bets on these fights and they tried to bred superior atheletes. I don't really think it worked as the nazi's tried to breed superior atheletes as did the romans with gladiators.