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What it says on the tin. I was reading through this thread and figured it could be fun to come up with a way for someone to come out of the War of 1812 a clear winner (since it seems like it's hard for any side to claim an absolute, clear victory). So either have the British utterly roll the USA, or the US achieve all of it's objectives (up to and including the absorption of Canada).
Extra bonus points if you can get the Indian Confederation to come out ahead.