MY BUDDY CHRIS’ SOLUTION:
two 15 foot high electrified fences with razor wire across the top and down the front side and buried into the ground (similar to what you see around Texas State Prisons), mine fields on each side for 100 feet, border patrolman with “shoot to kill” authority, some kind of moat with very hungry alligators.
IF YOU CAN GET ACROSS, YOU CAN STAY.