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Make Revolutionary France survive into the modern day (or at least longer than it did) with the calendar and some of the culture, etc. But of course, things change over time, so by all means include that.
Government form can somewhat change (though, as we've seen, terroristic oligarchies have ways of perpetuating themselves) but what I'm interested in is what kinds of massive butterflies do you all think the survival of the Revolutionary regime would release on the world?