You’re not really thinking this thing through.
What percentage of the American Military is of Mexican or Hispanic decent.
5 minutes after your invasion the left will be urging them to resist....
The vast majority of Mexican-American especially those in the military are patriotic and would welcome the opportunity to protect their country. The left better not be aiding an opposing military force.
A goodly percentage of the Border Patrol is of Mexican or Hispanic descent. They, like their felloows in the Army, do what they're ordered to do.