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Occurred to me when I ran into a description of Alsasce-Lorraine which was that it consisted of "A German speaking Protestant province and a French speaking Catholic province, and I'll let you guess which each thinks of when they talk about the region".
So... what if the Germans took Alsasce (i.e. the more German bit) and left the French Lorraine in 1871? Do things still get tense and irredentist?
(We can assume for now that the indemnity imposed on France was still the same.)