Earlier quoted context omitted.
Ok, so you take belgium "as a failed state", and the "Quebec factor", while ignoring, let's say... Switzerland? > If you look at the borders of Europe and how they flop around over time, it becomes clear that the 'delineating' factor is mostly ethnicity, at least crudely. No. I don't know why you would think that. Brittany was Gallo-Breton, and the two ethnicity almost cut the duchy in two. Two very, very different l…
This line of reasoning of 'finding examples where ethnicity fails to provide the boundary distinction' doesn't make your case. I know about 'Switzlerand', thanks. Which is why I brought up USA/Australia/Brazil etc.. Nobody is going to argue that there are many factors that drive boundaries (aka natural boundaries) merely highlighting some counter examples doesn't deconstruct the fact that ethnicity is the primary mar…
Likewise to "French ethnicity", a place where government policy is still actively engaged in destroying minority languages (and their cultures) and has been since Napoleon.
These "ethnic" borders you're pointing to are as much a product of political maneuverings using ethnicity as a platform, as they are any kind of "natural" product of ethnicity.