> But no... the legal categories of border rights are immutable and constant. Except of course, they're not, since the whole concept of restricting movement in

> But no... the legal categories of border rights are immutable and constant. Except of course, they're not, since the whole concept of restricting movement into the US didn't really being until about 1917 - before that you pretty much just showed up. (I know you know this, I'm just re-enforcing your point.)