The right of self-determination is certainly a fundamental right (or that's what United Nations says, and Spain signed it). I have never lived in Texas nor NYC

The right of self-determination is certainly a fundamental right (or that's what United Nations says, and Spain signed it). I have never lived in Texas nor NYC, so I can't really say much about it. I believe that Catalonia is large enough to warrant a referendum if enough people want it, especially given that so many people disagree with the treatment they are receiving from Spain. I accept the argument that we might not be different enough, but it's not the main reason a referendum should be held, in my opinion, and I'm not aware of many people from Valencia or Balears who want to leave Spain. At which point a region of a country has the right to secede? Or you are implying that no region from no country should ever have that right?