Nations, like political creeds, can be upbeat or downbeat. Along with North Korea, the United States is one of the few countries on earth in which optimism is almost a state ideology. For large sectors of the nation, to be bullish is to be patriotic, while negativity is a species of thought crime. Pessimism is thought to be vaguely subversive. Even in the most despondent of times, a collective fantasy of omnipotence and infinity continues to haunt the national unconscious. It would be almost as impossible to elect a US president who advised the nation that its best days were behind it as it would be to elect a chimpanzee, though as far as that goes there have been one or two near misses.

Terry Eagleton, ‘Hope Without Optimism’