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.
https://en.wikipedia.org/wiki/2013_Falkland_Islands_sovereig...
> 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.
a lot depends on the outcome. you can bet that the british empire didn't "let" the colonies secede, but they did anyway, persevered, and eventually the british "let them" by way of not pursuing the war.
and so, here we are. the same could happen with spain, or a state in the US, or w/e. winners tend to write the history books, as well as perspective on past events.