Wisconsin, Minnesota, Ohio, and Illinois(I believe, this could just be me rooting for my home state).
And I had a thought. Start it at the begining of the Mexican-American war(1840's), bringing Mexico into the game better. Also you need Canada, not as Canada but as part of the British Empire which was well powerful at the time. And end the game in 1893 with the start of the Spanish-American war(mabey even add the Carribean islands like Cuba).
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