Various popes, bishops and theologians have written about what constitutes a good regime (one that governs in accordance with the common good), and they have accepted the classification of regimes taken from the ancient Greeks. Political theorists from Aristotle to Leopold Kohr have talked about the limits to the size of a polity, and how good governance is not possible if a polity exceeds this limit. I would consider this to fall under "Natural Law reasoning" (that is to say, a precept concerning the limit to a size to a polity would be of the Natural Law, touching upon both the common good and good government). But is it something that the Church could ever endorse?