First off, Spanish speakers have lived in southern Colorado, but they never owned this area. It belonged to Native Americans, not the invaders from the south and Spain/portugal.  As such, Spanish speakers ARE foreigners, and more so, than English speakers. 

Secondly, there are LOADS of illegals in DPS. To claim otherwise is a lie. My SiL was an illegal and surrounds herself with them to this day. Most are nice, but some are just here to make money and leave. The families are not. They are here to try and live. BUT, it is prejudice on your part to try and claim that there were no illegals there. 
Finally, Illegal is short for illegal alien, which is NOT a pejorative. 
Just because YOU believe in PC does not mean that the rest of us must speak the way that you want.