Why cant we build a wall that close the entire southern boarder?
The Chinese built the Great Wall that spanned nearly 4000 miles using only the most primitive tools. They built it over mountains and deserts. Can the ancient Chinese accomplish greater feats of engineering than the modern Americans?
I sure that the most prosperous country that has yet existed on this Earth can manage to build an effective barrier to unlawful immigration.
Perhaps the illegal immigrants will find other paths in to the US (I am sure that some will), but when they do we will find new impediments to there new methods.
Wouldn't it be cheaper to hand out 50 cal. machine-guns to the border patrol mounted in towers 300 meters apart with some concertina wire between us and Mexico. That's how we set up our forts in Viet Nam. You put up a fence and they will come and climb it. You shoot them dead, and they will stop coming.