>>This is not an invasion here, it is an economic migration to a higher-wage area (for them). <<

I respectfully disagree. They know it is against our laws, so it is not merely migration, but rather willfull lawbreaking. No better than were I to come and steal your auto if you had a nicer one than I, because there were so many people in your neighborhood who were driving them (very nice cars), and in my neighborhood, most people (like me) had old clunkers.