that has control over its borders. it seems almost a precondition for what we think of as sovereignty. you can say who can come in and who can come out. you have borders that are defensible. within those borders, you have a democratic policy or whatever kind of regime you have. the state has a monopoly. this is all constituent pillars of what it means to be a country. when you say there are these negative costs to defending that border, making that border impenetrable or defensible, i think there are some people out there who say, well, look, there's costs to everything, but this has to be a priority because in some existential sense, we cannot be a nation unless we have this kind of thing. >> but there are differences with class, and what i think eliseo is talking about is why is it that enforcement comes out so heavily and so strong against people who are maybe from rural parts of mexico or central america? why is it you can allow for other countries to have access