Don't know if these might be of interest - they're essays, rather than fiction - but Robert Cowley has pulled together a series of essays by historians in three books:
What If?
More What If?
and
What If? America
which consider what might have happened if things had gone differently at certain points in history.
The only one I've actually laid hands on is the first (in my local Waterstones), and it did look very intriguing.
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