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Harry Turtledove is generally considered the master of alternate history fiction. He'd be a good place to start. I've read his "World War" series in which aliens invade during WW2 and it was fun. Lots of the battles and political machinations of the real WW2 woven into the story but end up being between humans and aliens instead of between human countries.
As for Sliders, I recently re-watched the show. My suggestion would be stop after season 2. Season 3 is ok but is where it started going off the rails. Seasons 4 and 5 are excruciatingly painful, like intentionally poking your eyes with hot needles really.
Cheers,
PKFFW
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