A nation is not to be defined by affinities of language or a common historical origin, though these things often help to produce a nation. Switzerland is a nation, despite diversities of race, religion, and language. England and Scotland now form one nation, though they did not do so at the time of the Civil War. This is shown by Cromwell's saying, in the height of the conflict, that he would rather be subject to the domain of the royalists than to that of the Scotch. Great Britain was one state before it was one nation; on the other hand, Germany was one nation before it was one state.

What constitutes a nation is a sentiment and an instinct, a sentiment of similarity and an instinct of belonging to the same group or herd. The instinct is an extension of the instinct which constitutes a flock of sheep, or any other group of gregarious animals. The sentiment which goes with this is like a milder and more extended form of family feeling. When we return to England after being on the Continent, we feel something friendly in the familiar ways, and it is easy to believe that Englishmen on the whole are virtuous, while many foreigners are full of designing wickedness.

Such feelings make it easy to organize a nation into a state. It is not difficult, as a rule, to acquiesce in the orders of a national government. We feel that it is our government, and that its decrees are more or less the same as those which we should have given if we ourselves had been the governors. There is an instinctive and usually unconscious sense of a common purpose animating the members of a nation. This becomes especially vivid when there is war or a danger of war. Any one who, at such a time, stands out against the orders of his government feels an inner conflict quite different from any that he would feel in standing out against the orders of a foreign government in whose power he might happen to find himself. If he stands out, he does so with some more or less conscious hope that his government may in time come to think as he does; whereas, in standing out against a foreign government, no such hope is necessary. This group instinct, however it may have arisen, is what constitutes a nation, and what makes it important that the boundaries of nations should also be the boundaries of states.

National sentiment is a fact, and should be taken account of by institutions. When it is ignored, it is intensified and becomes a source of strife. It can only be rendered harmless by being given free play, so long as it is not predatory. But it is not, in itself, a good or admirable feeling. There is nothing rational and nothing desirable in a limitation of sympathy which confines it to a fragment of the human race. Diversities of manners and customs and traditions are, on the whole, a good thing, since they enable different nations to produce different types of excellence. But in national feeling there is always latent or explicit an element of hostility to foreigners. National feeling, as we know it, could not exist in a nation which was wholly free from external pressure of a hostile kind.

And group feeling produces a limited and often harmful kind of morality. Men come to identify the good with what serves the interests of their own group, and the bad with what works against those interests, even if it should happen to be in the interests of mankind as a whole. This group morality is very much in evidence during war, and is taken for granted in men's ordinary thought. Although almost all Englishmen consider the defeat of Germany desirable for the good of the world, yet nevertheless most of them honor a German for fighting for his country, because it has not occurred to them that his actions ought to be guided by a morality higher than that of the group.

A man does right, as a rule, to have his thoughts more occupied with the interests of his own nation than with those of others, because his actions are more likely to affect his own nation. But in time of war, and in all matters which are of equal concern to other nations and to his own, a man ought to take account of the universal welfare, and not allow his survey to be limited by the interest, or supposed interest, of his own group or nation.

So long as national feeling exists, it is very important that each nation should be self-governing as regards its internal affairs. Government can only be carried on by force and tyranny if its subjects view it with hostile eyes, and they will so view it if they feel that it belongs to an alien nation. This principle meets with difficulties in cases where men of different nations live side by side in the same area, as happens in some parts of the Balkans. There are also difficulties in regard to places which, for some geographical reason, are of great international importance, such as the Suez Canal and the Panama Canal. In such cases the purely local desires of the inhabitants may have to give way before larger interests. But in general, at any rate as applied to civilized communities, the principle that the boundaries of nations ought to coincide with the boundaries of states has very few exceptions.

This principle, however, does not decide how the relations between states are to be regulated, or how a conflict of interests between rival states is to be decided. At present, every great state claims absolute sovereignty, not only in regard to its internal affairs but also in regard to its external actions. This claim to absolute sovereignty leads it into conflict with similar claims on the part of other great states. Such conflicts at present can only be decided by war or diplomacy, and diplomacy is in essence nothing but the threat of war. There is no more justification for the claim to absolute sovereignty on the part of a state than there would be for a similar claim on the part of an individual. The claim to absolute sovereignty is, in effect, a claim that all external affairs are to be regulated purely by force, and that when two nations or groups of nations are interested in a question, the decision shall depend solely upon which of them is, or is believed to be, the stronger. This is nothing but primitive anarchy, "the war of all against all," which Hobbes asserted to be the original state of mankind.

There cannot be secure peace in the world, or any decision of international questions according to international law, until states are willing to part with their absolute sovereignty as regards their external relations, and to leave the decision in such matters to some international instrument of government.[5] An international government will have to be legislative as well as judicial. It is not enough that there should be a Hague tribunal, deciding matters according to some already existing system of international law; it is necessary also that there should be a body capable of enacting international law, and this body will have to have the power of transferring territory from one state to another, when it is persuaded that adequate grounds exist for such a transference. Friends of peace will make a mistake if they unduly glorify the status quo. Some nations grow, while others dwindle; the population of an area may change its character by emigration and immigration. There is no good reason why states should resent changes in their boundaries under such conditions, and if no international authority has power to make changes of this kind, the temptations to war will sometimes become irresistible.

[5] For detailed scheme of international government see "International Government," by L. Woolf. Allen & Unwin.