The EU had a documented process for a member state to leave. It was untested and messy, but it existed.
There's no legal basis for a state to leave the US. Now it's possible we let it happen despite this, with or without armed conflict, but it's hard to imagine a hypothetical Texit not being messier than Brexit ever was
That wasn't my question. It was whether it is theoretically possible or not. Brexit was a peaceful event with all its checks and processes in place.
The EU had a documented process for a member state to leave. It was untested and messy, but it existed.
There's no legal basis for a state to leave the US. Now it's possible we let it happen despite this, with or without armed conflict, but it's hard to imagine a hypothetical Texit not being messier than Brexit ever was
last time they tried there was a civil war, that pretty much sums up how legal it is.