We can no more keep unwanted immigrants out of the U.S. than we can keep out smuggled drugs. It is impossible. It would remain impossible if we gave ICE a budget comparable to the DoD's. It can be slowed, but not stopped. So long as foreigners have conditions at home to run away from, and even the hope of opportunities here to run to, they will find a way in. The demographic changes populist-nationalists fear will happen, and will eventually change the demographics even of the whitest and reddest rural counties.