Imagine that you wake up one morning to find out you have no memory You're not able to remember who you are or what happened in your life yesterday or the day before that. You're unable to recognize your children, and you can't communicate with neighbors and other people because you no longer know how to greet them, and you can't understand what they are saying. You don't remember what the words "elections," "wars," or "movies" mean. Just as having no personal memory deprives us of a sense of our own identity, having no historical memory deprives us of a sense of our national identity and,...