>>214124883
Middle ages (essentialy iron age collapse), bronze age collapse, etc.
These were mostly technilogical decays though
History us obviously ciclycal, cultures and societies go through periods of expansion (normally imperial) and periods of contraction (normally socialist)
You could say that once a society reachs its expansive threshold it begins a modernity where it "equalizes" and then comes a post-modernity where it reverts to reactionary competition schemes between ideas, simulacras, beliefs, commodities, etc.
Kumbaya was never real, progressives were simply accelerating the surge of a postmodernity