Speaking of divided by extremism, I just finished watching the Netflix documentary "Join or Die," which is the movie-ization of the book Bowling Alone, about how the reduction in civic engagement (as evidenced by the smaller numbers in all kinds of fraternal organizations, as well as churches) is correlated quite convincingly with a rise in extremism. And how this also played out in a similar fashion during the Gilded Age.
And it makes a certain amount of sense; if kids learn how to deal with each other by having siblings and friends, it seems as though adults could learn as much by having friends they kinda-sorta HAVE to deal with, as opposed to virtual "friends" who can be unfriended, ghosted, or simply ignored when they piss you off. Personally, I think the rise in suburbs and "every man is an individual" ethos also contributes, as does, of course, the rise of the internet.
So I'll join a club or two.
Wendy P.