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The Armenian Genocide has a nice setup here with the OTL proposals laid out in the form of flowcharts.
Now obviously just saying 'WI one of these is adopted' is a bit hand-wavy, because the OTL system resulted from compromise and it's a bit ASB to say the small states just accept a system that favours the big ones without arguing and so forth. But I'm curious so let's just ignore plausibility at the beginning. Somehow, one of the other proposed systems (pick one) is adopted rather than the OTL American political setup. What ramifications do you think this would have in the long term for issues such as expansionism, free trade, slavery, foreign relations, suffrage reform, etc?