America is in trouble. We face four major challenges on which our future depends, and we are failing to meet them--and if we delay any longer, soon it will be too late for us to pass along the American dream to future generations. In That Used to Be Us , Thomas L. Friedman, one of our most influential columnists, and Michael Mandelbaum, one of our leading foreign policy thinkers, offer both a wake-up call and a call to collective action. They analyze...