Pull up the most recent data on how Americans rate their own lives, and a strange thing happens to the political map. The reds and the blues, the coasts and the heartland, the places that cannot agree on anything: line up their life satisfaction, their depression rates, their trust in the people next door, and the differences start to blur. Nearly everyone is doing worse. And nearly everyone is doing worse in roughly the same direction. That, in a sentence, is the uncomfortable headline of the..