The movement which began in the last half of the nineteenth century towards the conclusion of international agreements concerning matters of international administration, develops favourably during this period. The following conventions are the outcome of this movement:—(1) Concerning the preservation of wild animals, birds, and fish in Africa (1900); (2) concerning international hydrographic and biological investigations in the North Sea (1901); (3) concerning protection of birds useful for agriculture (1902); (4) concerning the production of sugar (1902); (5) concerning the White Slave traffic (1904); (6) concerning the establishment of an International Agricultural Institute at Rome (1905); (7) concerning unification of the Pharmacopœial Formulas (1906); (8) concerning the prohibition of the use of white phosphorus (1906); (9) concerning the prohibition of night work for women (1906); (10) concerning the international circulation of motor vehicles (1909).
It is, lastly, of the greatest importance to mention that the so-called peace movement,[65] which aims at the settlement of all international disputes by arbitration or judicial decision of an International Court, gains considerable influence over the Governments and public opinion everywhere since the first Hague Peace Conference. A great number of arbitration treaties are agreed upon, and the Permanent Court of Arbitration established at the Hague gives its first award[66] in a case in 1902 and its ninth in 1911. The influence of these decisions upon the peaceful settlement of international differences generally is enormous, and it may confidently be expected that the third Hague Peace Conference will make arbitration obligatory for some of the matters which do not concern the vital interests, the honour, and the independence of the States. It is a hopeful sign that, whereas most of the existing arbitration treaties exempt conflicts which concern the vital interests, the honour, and the independence, Argentina and Chili in 1902, Denmark and Holland in 1903, Denmark and Italy in 1905, Denmark and Portugal in 1907, Argentina and Italy in 1907, the Central American Republics of Costa Rica, Guatemala, Honduras, Nicaragua, and San Salvador in 1907, Italy and Holland in 1907, entered into general arbitration treaties according to which all differences, without any exception, shall be settled by arbitration.[67]
[65] See Fried, "Handbuch der Friedensbewegung," 2nd ed., 2 vols. (1911).
[67] The general arbitration treaties concluded in August 1911 by the United States with Great Britain and France have not yet been ratified, as the consent of the American Senate is previously required.
Six Lessons of the History of the Law of Nations.
§ 51. It is the task of history, not only to show how things have grown in the past, but also to extract a moral for the future out of the events of the past. Six morals can be said to be deduced from the history of the development of the Law of Nations:
(1) The first and principal moral is that a Law of Nations can exist only if there be an equilibrium, a balance of power, between the members of the Family of Nations. If the Powers cannot keep one another in check, no rules of law will have any force, since an over-powerful State will naturally try to act according to discretion and disobey the law. As there is not and never can be a central political authority above the Sovereign States that could enforce the rules of the Law of Nations, a balance of power must prevent any member of the Family of Nations from becoming omnipotent. The history of the times of Louis XIV. and Napoleon I. shows clearly the soundness of this principle.[68]
[68] Attention ought to be drawn to the fact that, although the necessity of a balance of power is generally recognised, there are some writers of great authority who vigorously oppose this principle, as, for instance, Bulmerincq, "Praxis, Theorie und Codification des Völkerrechts" (1874), pp. 40-50. On the principle itself see Donnadieu, "Essai sur la Théorie de l'Équilibre" (1900), and Dupuis, "Le Principe d'Équilibre et de Concert Européen" (1909).
(2) The second moral is that International Law can develop progressively only when international politics, especially intervention, are made on the basis of real State interests. Dynastic wars belong to the past, as do interventions in favour of legitimacy. It is neither to be feared, nor to be hoped, that they should occur again in the future. But if they did, they would hamper the development of the Law of Nations in the future as they have done in the past.