Oh wait, do you mean on the post apocalypse idea? Ehhhh I’m not certain it is. There is a creation story, and then a “do over” in the lore. But nothing like our civ level in the past for it.

There’s probably a lore video about it on YouTube somewhere though.

I’d recommend YouTube for easy to find lore breakdowns. For text stuff look up Michael Kirkbride.

Here’s a bunch of his stuff:
https://en.uesp.net/wiki/General:Michael_Kirkbride’s_Texts