Make "diplomacy" work for many other entities, like provinces inside a state, provinces to outside states, religions on religions, cultures, and so on.

[barrulus]

Maybe “rename” this feature to another word, in case diplomacy means something else, and Diplomacy have certain functions that cannot be transferred, the idea behind this added feature is to have a "friends and enemies" list without adding any extra overhead or requiring an underlying function that dictates a response on the map.

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Migrated from Trello during the backlog consolidation: https://trello.com/c/FiH0aqvh

[aersult]

To add to this, it would be great 'diplomacy' or relations fed into trade as well. For example, states at war or that don't know of one another shouldn't be trading, at least not directly