I had a good idea recently. Stop hyperventilating about Donald Trump and focus instead on American history; really focus. It is helping me and I highly recommend it. There is, of course, so much to hyperventilate and worry about, something new every day: Russian interference in the election and the President’s obvious unconcern, his rejection of the high moral vision expressed in American foreign policy for two and a half centuries and replacing it with a starkly different vision articulated by two top presidential advisers, H.R. McMaster and Gary Cohn in the Wall Street Journal: “The President embarked on his first foreign trip with a clear-eyed outlook that the world is not a ‘global community’ but an arena where nations, nongovernmental actors and businesses engage and compete for advantage.” That is a very different and harsh vision which David Brooks described as “moral decoupling…morality has nothing to do with anything…