Are we in trouble?

David P. Goldman writes on Facebook,

I finally got around to seeing "Dunkirk." It's very well made and conveys vividly what it must have been like to be there. Then I re-read Andrew Robert's account of the Fall of France. France and Britain had as many tanks as Hitler and comparable in quality but failed to concentrate them or coordinate with their air forces despite the example of Poland. Our Fall of France will occur over six years not six weeks as the Chinese economy nearly doubles. Our elite is as defeatist as the French (read Graham Allison's Thucydides Trap). And the last person among POTUS direct reports to think about these matters was Stephen K. Bannon. I'd say we're in trouble.