> how has the US lost the plot within such a short time? How did it go from the flag bearer of freedom and progress to isolationist bully that wants to invade Greenland and become best friends with Russia?

American culture has lost its near-monopoly on optimism. We're now almost as cynical as the Europeans. (:D)

That cynicism means civic disengagement, technological doomerism and general symptoms of depression. That collectively degrades the mostly bottom-up structures we've long relied on, requiring shifts to less-efficient (and hastily cobbled together) top-down command structures.

I disagree that the loss of optimism is causative. I've lost my optimism because I've seen what we're capable of as a country and it's not reassuring.

>That cynicism means civic disengagement

By what metric? You have to go through Scandinavia, Germany, Spain, and a few Eastern european countries before you get to the US on voter turnout. Not to mention labor unions striking as a form of political protest (eg Italian labor unions striking against the Gaza war). And depression prevalence also seems to be higher in the US. Did you mean worse than Europe instead of "almost as" bad?