Can't you integrate your PUs?
In theory, yes. But that costs 1 infamy/province, which kinda sucks compared with getting it for free. Besides, integrating Castile would give me like 70 points of infamy, which in turn would mean -3 stab and being engulfed by endless rebels. Maybe if they're the last nation on Earth, but otherwise no thanks. And then you can only integrate a nation once every 50 years so there wouldn't be enough time left.
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