Destructo6: Not to be a smartmouth, but in some areas along the border, how could you tell?
What's interesting to me is that in my area, downriver from Presidio, TX, there is little cross-border illegal traffic, all the way down to Del Rio. A local-area Mexican town, Manuel Benavides (aka San Carlos) has a very localized policy of scaring off would-be illegals, since "We belong to them", as we are a job-source. We get very few wets crossing in this area. Mostly, it's too damned harsh and rugged, and too much more walking to jobs.
Some years back, I drove along the old rail line from Columbus, NM to El Paso. The border is identified by a barbed wire fence. Well, the signs said it was an International Border. No farms, ranches, nor villages in sight. No Border Patrol (Puercos, Migras, in local parlance) in sight, either.
Isolated? They've had real, live train robberies west of El Paso!
Wetbacks? War on Drugs? Tell me a 'tory, Mommy?
FWIW, Art