The distinguished historian says the U.S. isn’t like other nations and never has been. There is no American ethnicity to back up the state.’ Democracy is a powerful and dangerous force, as America and the European democracies are discovering. Elites on both sides of the Atlantic haven’t done a very good job of handling it. We have some anniversaries coming up next year that may help us. We have, of course, the 250th anniversary of the Declaration of Independence. The same day is the bicentennial of the deaths of the two founders most responsible for that great document, John Adams...