its been like this for the last 10 years now.

Ever since the heavyweight division died out US inparticuarly decided to put a lot of emphasis on south american fighters almost all of which are lower weight fighters.

Yes they produce the better fights for a very simple reason - the lesser you weigh the more punches you are able to throw and the more punch resiliant you are because the guy hitting you is also small compared to a middle/heavy fighter who can bang you out with 1 punch.

Americans and europeans seldom produce smaller fighters because of the fact we are statistically much bigger in heighth and weight than your south american and asian countrys. Doesnt mean those guys produce the better fighters, just the littler ones!!