Building a wall worked so well for East Germany and Russia....
I am not a supporter of illegal immigration. I support changing things to make immigration simple and a sure thing for those who want to come to America to WORK.
My solution is simple. Allow one to purchase a Resident Alien Card at the border for $10,000, after submitting to a week long background check, screening for diseases, and giving of a DNA Sample, fingerprints, voice print, and photograph.
Automated gun turrets, fences, razor wire, and other such nonsense will not stop the determined.