What I've seen are short fences at best. Barely enough to stop a paraplegic. Gates are possible to build, not to mention a lot of the Rio Grande wouldn't need a

What I've seen are short fences at best. Barely enough to stop a paraplegic. Gates are possible to build, not to mention a lot of the Rio Grande wouldn't need anything built near it because of the natural geography and the sheer cliffs that are practically unscalable.