To set the record straight on the matter of liberty and immigration, let’s look to one of the most influential classical liberal thinkers, Ludwig von Mises, for guidance…
Cosmopolitanism is the belief in universal human rights, regardless of time or place. That each of us is a citizen of the world first, country second. It also denotes a law and morality that transcends all, and must be applied to everyone equally. But cosmopolitanism is more than just a recognition of the universal rights of others.
A society can’t close itself off and remain free.