There’s a big Economic Supercycle which lasts about 100 years, or around 3 generations.

We’re now at the most painfull point of that supercycle, when wealth has accumulated in too few hands as has real power, inequality has exploded, social mobility has crashed and growth has ground to a halt, so the elites have switched from capturing most of Economic Growth to pillaging existing wealth from the rest of the population - a handful of people are fine, most people are getting poorer and young people most definitelly don’t have the opportunity to “be anything you want”.

All this, of course, translates into social discontent, increased autoritarianism from those in power in order to keep said power (just notice the fast growing desire from widespread surveillance amongst mainstream politicians as well as the increase in anti-demostration legislation in supposedly Democratic nations) and political movements subsidized by the elites (i.e. the populist Far Right) that scapegoat foreigners (immigrants, “interference” from other nations) for the pain that most people are feeling so that they’re not punishing the local elites for their pillaging and the way they mismanage the country.

All this in turn translates into more wars: if you’re scapegoating foreigners for the pains in your country and/or there is not enough economic growth for the elites to grow more wealthy, then it’s only natural to go to war with other nations, either to “punish” them for their “fault” in the pain of the population or to take their shit to make the local elites richer.

Naturally, when people are discontent and have no real hope to change the way the place they live in is managed or they live somewhere that keeps getting attacked by foreign military because their elites want to steal your shit, a lot of them turn into “extremists”. Also a lot of things which are pretty natural and democratic things to do start getting painted as “extremism” by the mass media owned by the above mentioned elites and/or made illegal by said elites (when directly in power) or the politicians they bought.

And then most of this shit feeds around into reduced Economic growth, so less of it for the elites to capture, hence the elites pillaging even more, propagandize the “foreign enemy” even more, push even more for Far-Right parties and reduced democratic rights even more.

Social flows from Economic and Economic flows from social.