@waltercool @dcc @Bernard The Free State Project seems like the best attempt at creating a libertarian society right now, but I don't think any free stater has answered the question on what would they do if they do secede from the union, but the US government cuts them off of trade. Last time I checked, New Hampshire doesn't have oil reserves.
Also, they do expect a friendly divorce, which includes mutual cooperation in defense and trade, and likely a massive wall with Massachusetts.