“that is what immigrants from the United States did to Mexico by illegally immigrating into Texas and then taking over.”
Woah, woah, woah. Where did that story come from?
The government of Mexico appointed Stephen F. Austin the Empresario of Texas and empowered him to sell or give land to foreign men. This he did. No illegal immigration was involved.
The Mexicans did this because they were afraid of the Comanche, who treated them like sheep to be sheared and slaughtered. They hoped the Comanche would sate themselves on the new Texicans and leave them alone.
Do your research before overreacting. A LOT of Texans actually did immigrate illegally AFTER Mexico declared the border closed and that no more immigrants were to come in. Mexico failed to ENFORCE that edict (much like we have failed for YEARS to enforce our immigration laws). Yes, a lot of Texans were illegal immigrants. That is a fact of history that can not be overlooked.
Now, if Mexico wants it back, then Mexico must take back its illegals here and then fight for it. We fought for it and WON.