Why not a gator moat? If they are good enough for Alligator Alcatraz why not?
“”””Why not a gator moat?””””
Fifty years ago I had two suggestions.
One was that with all the guns cops confiscated from people, give one and 5 or 10 rounds to every illegal we sent back to the corrupt Mexican government they were fleeing, (Mexico would seal that border pronto).
Two was dispose of all of our nuclear waste along a border strip so that even if they came across they wouldn’t bother us for long, that was more to make a point about determination, than being realistic.