In the early 90's my Army engineer unit was sent to Arizona to build a border fence. This off course was not widely publicized. We built 6 miles of solid steel fence 9 ft tall in 4 weeks. Only worn an torn chainlink was there before. 2 weeks after we left it started getting blown to pieces. With no one watching it 24/7 anyone could walk up to it and put some TNT on it and they did. A border fence will only work if its built like the Berlin wall. A 24/7 standing armed guard at the wall with a mine field. I don't think Americans are willing to see this happen.
Walt
Walt