The power of history to speak to us depends on our ability to hear it. When we are deaf to its secrets, or too confused or conditioned to decipher them, we miss the opportunity to be empowered by them. We thus fail to overcome the propaganda our own government, like the dictatorships we revile, has all too often deceived us with. I am struck by this aura of static around a sensational new discovery. Researcher and author Krystyna Piorkowska, the Associated Press reported this week, has unearthed a “lost” U.S. document, dating back to 1945, known as the Van Vliet...