Apparently you missed American history 101
This reminds me a bit, of a plan Libertarians had, to move in sufficient numbers to one of the states of the US, to elect Libertarians to the legislature and a Libertarian governor.
And then, govern that state using Libertarian principles, and see how it would work in the real world.
to the extent that people see the states as “laboratories” to govern in different ways, we can see results in some places.
For example, California has become increasingly liberal/Democrat/nanny state in some ways. New York City is proud of being a liberal bastion. Other states, especially in the midwest and south, are more traditional/conservative in outlook on the issues of the day.
So do we need new “republics” to test new ideas? In some ways, since we have liberal dominance of some places, we are seeing what unfettered liberalism can be like.
As I recall, we had this discussion back in 1861.