There is a fundamental problem, some would say contradiction, in libertarian reasoning: if you have an open libertarian society with open borders, non-libertari

There is a fundamental problem, some would say contradiction, in libertarian reasoning: if you have an open libertarian society with open borders, non-libertarian inclined people who are none the less interested in the prosperity of libertarian societies can move in and eventually destroy that libertarian society. An internally libertarian society with strong immigration control solves this problem and would be called "nationalist" by most traditional libertarians.