ULTRA-SHARP barb wire at the top would help stop the invaders.
Good old razor wire
I vote for concertina wire about 4 rows deep on the US side. So you can climb, how’s your long jump???
And then signs in multiple languages..saying we have claymores...pointed right at you.
Yep!
Get the wall built with current specs. Then adding razor wire can be done with maintenance funding.
Ultra sharp barbed wire can be cut. I the countries they come from, the tops of the concrete walls surrounding homes snd businesses have chards of broken glass embedded in the concrete and standing upright.
The border crisis can be ended quickly. Announce that effective tomorrow anyone crossing border without first passing through immigration snd customs will be shot dead on site. Likely less than 100 will die before illegal entry stops. If statistics are correct that 3000 to 4000 US citizens are killed every year by illegals, the government does have a duty to protect its citizens.