There seem to be a lot of Alternate History
and "Parallel World"/Multiverse stories (in which it's sort of implied, if not directly stated, that our own world is "out there somewhere") but what about a story set in the "now" of a world where there was some historical POD that sets it apart from the world we know?
The POD is not explored (or possibly even made obvious or elaborated on, perhaps there was more than one) it's not set in the distant past after the POD or arrival of Alien Space Bats
or whatever, it's just a world that's different from this one but in its Early 21st Century.
Would that be "Alternate History
" or a "parallel world" or what?