It's just an observation. I mean, look at it. Bo Jackson, Michael Phelps, Tiger Woods, Tony Hawk, Jim Brown (Another one I've never heard of), Michael Jordan. These are certainly great athletes, but one cannot deny they are American.
Personally, I'd say Muhammad Ali would be the greatest athlete.
Look at what the show were this comparison was made had athletes from all over the world.
wilson six one 95 team-volkl cyclone 17 gauge at 62lbs.