I'm starting to think there's something to the idea of a national culture - nothing genetic, but a set of high-level assumptions and attitudes about life that inform the vast majority of people in a region, across the political spectrum. I've personally run into vast differences in attitudes about privacy and government between Americans and Germans, and I've been thinking a lot lately about Heinrich's 'WEIRD' paper (which finds differences between Americans and other Western nations - and Western nations and the rest of the world - on psychological tests.)

I suspect that because of certain prevalent American values (autonomy, distrust of authority, a bit of the Horatio Alger myth) they've naturally optimized to the work environment best suited to them. I further suspect that America could only switch to a German system very, very gradually. The country's just not currently suited for social democracy - they'd be terrible at it.