To win, you have to control certain provinces, this list is mostly unique for each major faction. If you can bribe everyone into alliance it may be a way to win if you have the money, but i think that being allied with some faction that controls a key province wouldn't count for a win so you'll be forced to break this alliance sooner or later. I'm not sure though, didn't play the game much.
Supply wagons provide (finite) supply of food if normal province supply is exhausted.
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