Just the other day, in response to a question from an interviewer, Elon Musk said this (essentially anyhow, I've cleaned it up a bit for him):
If you took the people of Italy and teleported them to the United States, the land where they came from would still be Italy. But if, after all the Italians had been teleported to the U.S., you teleported a bunch of people to Italy from some other part of the world, then the geographic region where those immigrants landed would no longer be Italy. It would be that other country from which those people had come. A country is its people not its geography.
If you remove the unecessarily nerdy "teleport" business, this remark is bound to remind some people of Hegel's views regarding Volksgeist or national spirit. On the orthodox interpretation of the Hegelian conception, what makes a nation is basically a matter of its cutural and religious traditions. That Italy is currently located somewhere in Europe is just a historical accident: what makes that place Italy is essentially a matter of language, religion, ethical views, public law, cuisine, arts, fashion, etc. According to Peter Wolsing, such a view "recognizes no higher ranking international right, nor does it defer to ideals of universal human rights [since] universal right is necessarily rooted in a particular nation state."*
As Hannah Arendt wrote in her Origins of Totalitarianism, "The practical outcome of this [Hegelian conception] was that from then on human rights were protected and enforced only as national rights and the very institution of a state, whose supreme task was to protect and guarantee man his rights as man, as citizen and national, lost its legal, rational appearance and could be interpreted by the romantics as the nebulous representative of a 'national soul' which through the very fact of its existence was supposed to be beyond or above the law."
Aside from the dire political perils, one may wonder what Musk would consider to be the effect of a migration of only a portion of the population in one direction or another.What happens if only half of Italy leaves and is replaced by immigrants? Or, again, consider the results of the population of (European-based) Italy moving to a previously emptied out portion of a federally organized polity like the U.S. Suppose, for example, that 50,000 Italians moved en masse to a completely decimated Rhode Island and so had become the only people living in that area. Would that mean that an "American Italy" now exists in the midst of the states that had formerly comprised New England? Would those Italian citizens therefore not be subject to U.S. laws...or would that just be a matter of which group has sufficient power to subdue the others (the non-Italians or non-Americans) and enforce what laws it wishes within this region's borders?** It certainly calls for an extremely Schmittian analysis.
In sum, Musk's offhand remarks are not simply the expression of a dangerous vision, one long associated with 19th Century romanticism, 20th Century Nazi ideology, and current justifications for geoncide, they can also be seen to be incoherent when looked at closely. As I discuss in my book, there are numerous reasons for concluding that polities need to be understood to be essentially territorial/geographical or nothing sensible is likely to be drawn from the world of politics and law.
* From "Hegal on Ethical Life and the Modern State." It is important to note, however, that Wolsing himself thinks that Hegel's position is more liberal than a strict focus on Volksgeist suggests because of his conception of a historical world spirit--the "higher universal law of history." I want to stress that I am not a Hegel scholar; I here just report a long orthodox interpretation of Hegel's influence on later political positions. For a detailed, discussion of many of the relevant issues involved here, I recommend Istvan Hont's classic paper "The Permanent Crisis of a Divided Mankind: nation state and nationalism in historical perspective."
** It's also easy to see how this conception might invite the dreaded sorities paradox to swallow up the entire issue.