Open immigration

But the moral case for open immigration is paramount. That case is this: a geopolitical border is a grotesquely arbitrary reason to prevent people from dealing with each other in whatever peaceful ways they choose.

Also, why should one be constrained by choices one didn't make? One doesn't choose to be born in a certain place. Of course, we are constrained by circumstances, many beyond our control. However, why should laws and political boundaries constrain individuals?