CA is just representing an abstract concept with building choices as they often do (religion in BI). A province with a city is devoted more to an urbanized, commercially based society, while one with a castle is more aristocratic and feudal in nature. I think this system will actually do a good job of representing the different styles of government in the middle ages. And I would be surprised if they don't have some sort of fortification buildable on the map similar to RTW's forts
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