Muslim bans existed under... Trump? I fail to see any other historical example. And I would consider those not great. And the 19th century wars with Mexico didn't come along with any robust (or even statutory?) system of immigration enforcement. As for Native Americans, this is another example where "migration" gets conflated with "State-sponsored violent colonization and intentional genocide." Nothing like is happening in any context here, nor is that anything like what "open borders" libertarians (of which I consider myself one) advocate. There's nothing inherently incompatible between open borders and a robust system of contracts and property rights.