I'm sure there are more; these are just three I'm familiar with.
https://en.wikipedia.org/wiki/Category:Sovereignty_referendu...
About Flakland Islands I don't know, so I don't have an opinion.
> Do you think that USA would allow Texas or Lakota Nation to secede?
I think Symbiote was using Scotland as an example to prove that this wasn’t out of the question.
https://en.wikipedia.org/wiki/2013_Falkland_Islands_sovereig...
I'm sure there are more; these are just three I'm familiar with.
https://en.wikipedia.org/wiki/Category:Sovereignty_referendu...