Halfway done with the Britannic Union chapter!
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The others have mentioned possible coalitions against the RU to destroy it, but if we are talking a peaceful about-face: The last chance was likely Teddy Roosevelt's assassination. He wanted an actual democratic election. If he had got his way, perhaps if Steele was assassinated or simply wasn't as popular or feared, and he became President, we'd likely see the Union slowly become more like the OTL Age of Trusts. There would still be scientific racism, still be Fundamentalism, etc, but I think the Bull Moose Movement would have seen their control over North America as the New Jerusalem and not go on a random crusade in S. America to exterminate everyone. It would still certainly be a dystopia, but it wouldn't be as bad 2.0 so far with Steele. However, in an election-having RU, it's still possible that Oswald could come to power. And if that happens, all bets are off. lol