I ask for answers and you give me Libertarian talking points. Obviously, you have no viable solutions you only want to complain. Thank you but no, thank you. Not interested.
It seemed to me that the question you posed re: securing borders north and south, plus coastlines seemed a reasonable impossibilty to me as well. But you were looking for 'real' answers. Uh huh.
Well, I think I'll just sit this one out and let you'all work on the micro methods needed to solve a problem that may, at it's root, have a macro solution. Sure beats offering a libertarian non-solution to the inevitable alien invasion that perhaps mirrors the WOD. "It can't be done, but with enough money, we can get it done!" hahaha