The European Union is a besieged institution. It is struggling in vain to overcome the eurozone crisis and faces an influx of refugees not seen since World War II. The Schengen Agreement is a dead letter, and Britain stands on the brink of leaving altogether. The EU is unfit for the challenges of the coming age of increased global competition and high tech. In sum, the drive for an “ever-closer union” has set Europe on the wrong course: plunged it into depression, fuelled national antagonisms,...