I *think* that on normal, things are less hectic. In other words, you do still get kamikaze factions controlled by the puppet master campaign AI, but they are less frequently flung against you.
I played a GB campaign on normal and seemed to be able to remain allied to those with whom i was most friendly (Iroquois for one!), but I've also observed that the campaign AI always wants you to be at war with someone. So if you do wittle away your enemies ("hostile" or "indifferent" factions), eventually your best friends ("friendly" and v friendly") will be zombified one by one.
This is much worse on H as, in a now aborted Russian campaign, every bugger with whom i shared a border DoW'd on me -including Poland/Lithuania, Courland, Georgia (with whom i'd set up a trade agrement), Dagestan, and the last straw: Persia (with whom i was Friendly, was trading and had granted military access. Russia is meant to be challenging, but not neccessarily to that extent...
The most glaring inconsistency in that Russian game was that everyone seemed to piling in on me, the greater my strength became (still not that great -15 turns in is not far for Russia's economic development!) and not concentrating their forces against closer foes with whom they shared more borders and were already at war with.
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