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What does need to happen for a westphalian state that is actually in Westphalia? The country needs at least Münster Dortmund and Arnsberg (former duchy of westphalia) and should not own Kassel as the Bonaparte Westphalia did. The capital of this state should be somewhere that is generally considered westphalia and even if this is not a completely defined area it shouldn't be in Hesse or the Rhineland.
Who could rule this country? And what would Prussia get in return for this?