What are you talking about? Can we avoid the Reddit/twitter style of comment? If you have an argument or a point to make just make it.
Is this one of these stupid "yeah 300 years ago this used to be on that land!!!" argument? Buddy, if so, stop living in the past. Territories are conquered all the time everywhere throughout the entirety of History.
Plus, this has nothing to do with current immigration laws.
The point is that families didn't just evacuate when it turned into US territory. There are very strong ties to Mexico in the southwest that will never go away.