There has only ever been one American fighter in UFC though which was Andre the chief Roberts, there hasn't been anyother fighters in UFC that are American. We are just a melting pot from all over the globe.
Its a shame Roberts left because he was the best SHW ever in MMA and the only American fighter to ever compete in UFC, he was a bad ass. Bloodline from 1120, but apart from The Chief, there has not been any American fighters in UFC I'm afraid
Its so cute seeing all these people bad mouth so called American fighters, that none are champs, because the ones you are bad mouthing are all from your countries!. As I said there has only ever been one American fighter in UFC