The development of such a citizenship is one of the great moral and educational problems of this century. It cannot mean a vague cosmopolitanism. It must mean the training of people who have learned to modify their national policies so that these do not make impossible an international allegiance. This war has offered us an example of such citizenship. The Canadians, Australians, and New Zealanders who are fighting in Flanders and at the Dardanelles are living and dying for the largest political organization the world has so far known. Their allegiance in the British Empire is to a State which embraces one-quarter of the human race. Never before in history have men been loyal to so great and so diversified a unit. They have literally come from all the ends of the earth to preserve a union of democracies. They have shown by example what any World League most needs to know, that federalism on a grand scale is not an idle dream. _The New Republic, March 20 and June 26, 1915._ THE ECONOMIC BOYCOTT [Sidenote: The nations have a powerful non-military weapon.] In the discussion of an International Executive entrusted with powers to compel the fulfilment of treaty obligations, it must not be assumed that coercion can only be exercised by the employment of armed force. The boycott is a weapon which could be employed with paralyzing power by a circle of nations upon an offender against the public law of the world. No nation to-day, least of all the great industrial and military Powers, is or can become socially and economically self-sufficient. It depends in countless ways upon intercourse with other nations. If all or most of these avenues of intercourse were stopped, it would soon be reduced to worse straits than those which Germany is now experiencing. If all diplomatic intercourse were withdrawn; if the international postal and telegraphic systems were closed to a public law-breaker; if all interstate railway trains stopped at his frontiers; if no foreign ships entered his ports, and ships carrying his flag were excluded from every foreign port; if all coaling stations were closed to him; if no acts of sale or purchase were permitted to him in the outside world—if such a political and commercial boycott were seriously threatened, what country could long stand out against it? Nay, the far less rigorous measure of a financial boycott, the closure of all foreign exchanges to members of the outlaw State, the prohibition of all quotations on foreign stock exchanges, and of all dealings in stocks and shares, all discounting and acceptances of trade bills, all loans for public or private purposes, and all payments of moneys due—such a withdrawal of financial intercourse, if thoroughly applied and persisted in, would be likely to bring to its senses the least scrupulous of States. [Sidenote: But effective use requires co-operation. And a boycott injures also those who apply it.]