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alternatehistory.com
I suggest 1979 because I've seen it referred to as the pivotal hinge year of the second part of the 21st century (Iranian revolution, beginnings of neo-liberalism in the Anglosphere, Soviet invasion of Afghanistan etc). And 1911 probably for obvious reasons, a year a century ago.
The point of this is to ask whether we're perhaps a bit too zealous in handwaving things as ASB, or if, no, the events of the intervening sixty eight years between 1911 and 1979 were quite "plausible" when judged by the standards of AH.com.