You may very well be right. But, at least in recent years, I can't think of any. Name some of them. I don't mean top contenders but legit champs. It seems Americans dominate the heavyweights and the Mexicans/South Americans the lighter weights, Pacman being a glaring exception.
Americans dominate the heavyweights?
Supermiddle weight: Lucian Bute,
RomanianCruiserweight: Previously Tomas Adamek was king of that division until he moved up to Heavyweight.
Polish.
Heavyweight: Klitscko Brothers;
UkraineAs for Uk fighters in recent years you had Joe Calzaghe who was rated P4P number 2 when he retired, having a record of 46-0-0. 2 division weight world champion at LHW and Supermidde weight.
Then you have Lennox Lewis and Prince Nasseem who have retired not too long ago, same can be said for Chris Eubank, Nigel Benn and Steve Collins. All champions.
Today you have Carl Froch (former WBC champ just 1 fight ago) and Amir Khan (silver medalist in the Olympics and now WBA champion).
Amir Khan is training under Freddie Roach so no doubt he will become even better in the future.