I mention decline a lot on here, in passing, as in decline of the western empire. But I don't feel I have a good grasp of the history of empires more generally (well, things that have gotten that label in history, like the roman empire).
And I don't want to end up in bougie land trying to learn more about it, cause I figure they're going to romanticize empires more so.
Not commie or marxist but The Fall of Civilisations podcast is pretty good.