The AI does seem to keep on fighting, but isn't as bad as previous TW titles.
As GB, I declared war on Sweden when they attacked Hannover (why? - the Russians, Poles and Danes were kicking their rear already!). Sailed my army from Morocco, grabbed a few reinforcements from London, then landed on Sweden. Took a couple of turns to attack an undefended capital city (after destroying a field army). I was tempted to keep Sweden (10k+ income!) but the resistance level was 20! So I offered Sweden to Sweden for peace + 2 techs. They accepted.
An AI idiocy that I don't like is the Huron's declaring war on me, two turns after I gave them a state gift to make them friendly (~ +40). They still showed up as friendly when they declared war on me! Friendly, and at war?!
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