The U.S does not care about the southern border, look there is a town on long island where you have thousands of illegals, you want to round them up, just get immigration to come on a weekday morning and you could deport them all, you want to fine the contractors hiring them, well set up a sting, everybody knows where to go
but again we don't care, they do work that nobody here wants to do, so the government could care less
you are right though even if the government did care it would take the military to secure the border
the only way you stop it is to have a mexico with a good economy
I never understood why latin america could not improve its economic situation, then again I can, corrupt governments, i laugh when republicans try to laud those great democracies down there