The United States is going through a great power shift. Working-class whites don’t think of themselves as an elite group. But, in a sense, they have been, certainly compared with blacks, Hispanics, Native Americans and most immigrants. They were central to America’s economy, its society, indeed its very identity. They are not anymore. Donald Trump has promised that he will change this and make them win again. But he can’t. No one can. And deep down, they know it.