As I’ve mentioned before, I’m fascinated with the multiverse theory and will read up on any quantum physics essay about it, and that’s part of the reason I loved the show Sliders until it became the Kro-Mag show.
The other day at a yard sale I found a book that takes place in the 1950s or 60s in an America where the British stamped out the colonial rebellion which is a scenario I’ve wondered about. I have some Harry Turtledove who writes about the “South won” scenarios as well as an alien invasion during WW2 forcing the powers to unite.
Anyone have any other authors they read in this genre?
When it comes to S.M. Stirling: I would kill for more in The Lords of Creation series.
(Incidentally, that series features an alternate history cold war-- where early sci-fi ideas of civilization on Venus and Mars turn out to be true, and the space race kicks off in earnest because of humans being found by a probe on Venus.)