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[The Valkyrie]

But then who will protect from the hordes of rapists from Mexico?

I'm no expert but one idea is to build an enormous wall along the border. That way, they would only need one person at each end with night vision goggles and catapults to stop them.

I was thinking something like Hadrian's Wall. A tall, fortified wall running along the entire border, with garrisoned fortresses every couple of kilometers, manned by volunteer groups of heavily armed militias.

Back this up with drones flying support and attack helicopters. Possibly even with gun emplacements, minefields, and tanks.

If you're familiar with it, perhaps even something like Mega-City One's West Wall.