As Ben Fountain sees it, the United States is facing its third existential crisis. The first was the struggle over slavery, culminating in the Civil War. The second was the Great Depression, the worst economic downturn in the history of the industrialised world, which brought about the New Deal. The third, is Donald Trump. But how will it end? Taking in America's love affair with firearms, celebrity culture, Russia, Obamacare, Hillary Clinton and, of course, Trump himself, Beautiful...