Being involved (prior to Fight Matrix) in the rating system at BoxRec, I discovered many of the factors that prove to be advantages (or disadvantages) to fighters. One of them was the advantage of fighting on home soil. This seems pretty obvious, but the advantage was MASSIVE, much larger than you’d expect. Due to the maturity and availability of data at BoxRec, we were able to determine that this advantage was more directly correlated with a promoter advantage as nationality isn’t always “cut and dry”, case in point, the many eastern European fighters making their money in Germany.
In the end, we decided not to implement this into the rating system as it did have some difficulties; some boxing cards have multiple promoters and fans would find it strange that this influence was factored out of the ratings. Anyway, from the start of Fight Matrix we have collected nationality data and most recently, I have routines that give a “best guess” as to where a fight took place. I wanted to look at data regarding American fighters, as it was the most plentiful. Anyway, here we go:
By the way, be prepared to be surprised.
[#5 W105] 
[#8 MW] 
[#13 MW] 
Here’s who remains: