It's not quite so black and white, though, because if you say that people have the unlimited right to form their own country, then where does that right end? D

It's not quite so black and white, though, because if you say that people have the unlimited right to form their own country, then where does that right end? Does a city, or a small group of people, or a single person have the right to declare themselves an independent country? What about when the cause itself is ambiguous or outright unjust (i.e. the South in the American Civil War)? That's why I think the cause itself and the claimed grievances have to be considered and are the most important part of the discussion.