Weird. I have not really encountered this extreme difficulty in making peace with the AI and I am playing on VH campaign difficulty. For example, playing as Prussia, I was at war with 7 factions at the same time, but I was actually fighting only two of them. For the heck of it, I offered the other five trade rights + peace (no cash, no land). All accepted...
Sure, there is a faction here and there, that's just stubborn to death. But that's alright.
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