The German-speaking inhabitants of central Europe did not automatically think of themselves as Germans - not before 1871 and not always after unification. In fact, they spoke mutually incomprehensible dialects, owed allegiance to different leaders, worshiped in different churches, and would not have recognized each other's customs. If asked about their identity, these prospective Germans might have answered Austrian, Bavarian, or Prussian, and they could as easily have used more local labels or resorted to occupational markers. For this disparate population to think of itself as German, that...