[99] The best thing for Europe might be that Russia (perhaps including China) should be regarded as a serious danger by all the civilised powers of the West. _That_ would bring us nearer to the United States of Europe _and_ America (for the United States, America, is Russia’s neighbour on the East) than anything else. European federation would likewise meet all difficulties where a risk might be likely to occur of one nation intervening to protect another. As we have said (above, p. 64, _note_) nations are now-a-days slow to intervene in the interests of humanity: they are in general constrained to do so only by strong motives of self-interest, and when these are not at hand they are said to refrain from respect for another’s right of independent action. Actually a state which is actuated by less selfish impulses is apt to lose considerably more than it gains, and the feeling of the people expresses itself strongly against any quixotic or sentimental policy. It is not impossible that the Powers may have yet to intervene to protect Turkey against Russia. Such a step might well be dictated purely by a proper care for the security of Europe; but wars of this kind seem not likely to play an important part in the near future. We have said that the causes of difference which may be expected to disturb the peace of Europe are now fewer. A modern sovereign no longer spends his leisure time in the excitement of slaying or seeing slain. He could not, if he would. His honour and his vanity are protected by other means: they play no longer an important part in the affairs of nations. The causes of war can no more be either trifling or personal. Some crises there are, which are ever likely to be fatal to peace. There present themselves, in the lives of nations, ideal ends for which everything must be sacrificed: there are rights which must at all cost be defended. The question of civil war we may neglect: liberty and wise government are the only medicine for social discontent, and much may be hoped from that in the future. But now, looking beyond the state to the great family of civilised nations, we may say that the one certain cause of war between them or of rebellion within a future federated union will be a menace to the sovereign rights, the independence and existence of any member of that federation. Other causes of quarrel offer a more hopeful prospect. Some questions have been seen to be specially fitted for the legal procedure of a tribunal of arbitration, others to be such as a federal court would quickly settle. The preservation of the balance of power which Frederick the Great regarded as the talisman of peace in Europe—a judgment surely not borne out by experience—is happily one of the causes of war which are of the past. Wars of colonisation, such as would be an attempt on the part of Russia to conquer India, seem scarcely likely to recur except between higher and lower races. The cost is now-a-days too great. Political wars,