[RLK]

Build a suitably high wall with periodic guard towers. Shoot anybody or anything attempting to go over the wall or approaching it.

[JackelopeBreeder]

Bookmarked your stuff on zolatimes.com; looks like good reading.

The border patrol has portable towers here - trailer mounted and pneumatically raised. Full suite of video and infrared sensors. Not enough of them, though. We have 80+ miles of border.

[CurlyDave]

Build a suitably high wall with periodic guard towers. Shoot anybody or anything attempting to go over the wall or approaching it.

I bet our "silent servant", electricity, would be useful in making this fence hard to get over...

[11B3]

"Build a suitably high wall with periodic guard towers. Shoot anybody or anything attempting to go over the wall or approaching it."

How about just a continuous stretch of high voltage triple strand concertina (properly staked with apron) for the first line of border, folowed by a 50 meter "dead zone" of raked sand and filled with AP mines for the second row, and lastly those towers using GSR coupled to ground mounted 20mm Vulcans. All towers manned by National Guard. End of problem, guaranteed - and people would be volunteering for duty.