No one is arguing the effect; that's obvious. The argument is the cause. I tip my hat to UK boxing, HW and otherwise. I wish Americans were as interested.
But again, success in any sport is going to be a reflection of the % of people that do the sport.
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100% Bullshit.
America have more current heavyweights than any other country by far!!!! Go look at at the boxrec stats. America has hundreds of current heavyweights. They just all suck. America has the quality but lacks the quality.
Plus America get everything in a plate with all their amateurs being able to turn pro, loads of Tv channels showing boxing, best gyms/facilities, best trainers, etc
If you last sentence was true then black americans should be dominating The heavyweight division. But they aren't. Because they simply are not good enough. Since boxing became a more global sport their success has been going down and down. Stop making petty excuses and just admit they aren't good enough.
Every country in the world has boxers, its a worldwide sport. Some countries/some people are good at it and some people/some countries are poor at it. I could list many examples were there is big numbers of boxers from a place but they all can't fight and get to any decent level. And I can name places were there is only a small number of boxers and they are good at it.
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Are you one of these people who think a Povetkin or Pulev would dominate Ali because they were born later and a bit bigger?