My best guess with Spain is that rebels had spawned in one of their former colonies, perhaps in Africa or Asia, and you simply didn't notice them. I think that, given enough time, rebels holding one province can enforce their demands and in this case those demands would have been to release all Spanish cores.
That said, I can't see a Spanish province anywhere else in your screenshots apart from Iberia and so that somewhat weakens my theory!
That said, I can't see a Spanish province anywhere else in your screenshots apart from Iberia and so that somewhat weakens my theory!
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