You are detailing a consequence of an international crisis, not so much some novel concept in the US.
This problem is also starting to show up in the EU, since there is pressure to adopt monolithic policies across member states.
But the concept is not complicated - you should give people mobility, so that they can go wherever there are policies they most agree with. That is it.
The problem is that international mobility is crippled by bureaucratic immigration policies in addition to the classic cultural and language barriers. Thus, postulating that states should be more independent in their policies is right, but it needs to acknowledge that fundamentally it does not matter if it is states in a country or individual countries or something like city states or homesteading, all that is required is the ability for individuals to migrate where their ideologies and the states match.
And the modern world is often simultaneously the best and worst time for such mobility. In terms of real physical barriers, there are pretty much none - flight has advanced sufficiently it is not prohibitive in cost for many people in the world to realistically save up enough to fly anywhere else. Simultaneously, in the past it was much easier to just "cross boarders", where the bureaucracy and monitoring of citizenship was much reduced.
Hopefully we progress to minimize or remove the latter, because it is the best outcome for everyone except those who want to prevent mobility to hold power over groups of people who would not stay if they had a choice.
This problem is also starting to show up in the EU, since there is pressure to adopt monolithic policies across member states.
But the concept is not complicated - you should give people mobility, so that they can go wherever there are policies they most agree with. That is it.
The problem is that international mobility is crippled by bureaucratic immigration policies in addition to the classic cultural and language barriers. Thus, postulating that states should be more independent in their policies is right, but it needs to acknowledge that fundamentally it does not matter if it is states in a country or individual countries or something like city states or homesteading, all that is required is the ability for individuals to migrate where their ideologies and the states match.
And the modern world is often simultaneously the best and worst time for such mobility. In terms of real physical barriers, there are pretty much none - flight has advanced sufficiently it is not prohibitive in cost for many people in the world to realistically save up enough to fly anywhere else. Simultaneously, in the past it was much easier to just "cross boarders", where the bureaucracy and monitoring of citizenship was much reduced.
Hopefully we progress to minimize or remove the latter, because it is the best outcome for everyone except those who want to prevent mobility to hold power over groups of people who would not stay if they had a choice.