The Europeans seem to understand that the Brexit vote is a wake-up call about dissatisfaction with the E.U. that’s nearly as widespread on the continent as it is in Britain. Germany, in particular, recognizes that unless the E.U. can quickly show a readiness to reform and streamline its bureaucracy, other nations may follow Britain out the door. Senior Fellow for the Future of Diplomacy Project, examines how the Brexit vote compairs to division within the United States.