Lousy, worthless , without validity comparison / comment......Americans can leave anytime they wish. Ain't no Berlin Wall BS........ Mexicans can leave anytime they want through approved egress points.
Why do you make such a comment when you know better ?
Did you see that "Day After Tommorrow" movie where the entire U.S. population had to evacuate south - can we at least build this wall with a one-way escape hatch?