Fear has almost always played a large part in welding States together. The fear of England was a great argument for federal union under our Constitution; the sense of weakness in the presence of unfriendly neighbors undoubtedly helped to break down the separatism of the little German principalities. Just as the appearance of an enemy tends to blot out political differences within a nation, so it will often unite a number of nations. The rise of Germany had that effect on the Great Powers of Europe; the fear of her created a league almost coextensive with western civilization. It covered up the feud between France and England which comes down through the centuries; it jolted together an understanding with Russia, the great bogy of liberals. It is not pleasant to think of fear as one of the most powerful forces that unify mankind. It would be more gratifying to think that cooperation was always spontaneous and free. But the facts will not justify this belief. The inner impulse to compose differences seems often to work most actively when there is pressure from without. Forced by danger to cooperate, men seem to discover the advantages of cooperation. The Germans are daily discovering good qualities in the Turks; the British are seeing deeper into the souls of Russians.... The only way in which, world organization can command a world patriotism is by proving its usefulness. If it affords a protection and produces a prosperity such as the national State cannot produce, it will begin to draw upon the emotions of men. If they are capable of loving anything so abstract and complicated as the British Empire, or even the United States, they are not incapable of attaching themselves to a still larger State. For the moment it was evident that patriotism could embrace something more extensive and abstract than a village which a man might know personally, world organization ceased to be an idle dream. If men could be citizens of an empire scattered over all the seas, there was no longer anything inconceivable about their becoming citizens of a State which covered modern civilization. The idea has ceased to be a psychological impossibility. [Sidenote: Problem is to broaden the basis of loyalty.] Our problem is to broaden the basis of loyalty. And for that task we have considerable experience to guide us. Within a hundred and twenty-five years we have seen the welding together of the United States, Germany, Italy, and Austria-Hungary. We have seen small rival States converted into members of federal unions. We have watched patriotism expand from the local unit to the larger one. We have seen Massachusetts patriots converted into American patriots, Bavarians into Germans, Venetians into Italians. In the last few years we have been witnessing the growth of an imperial patriotism within the British Empire. [Sidenote: Loyalty will not stop at existing frontiers.]