The period 1856-1874.
§ 48. The next period, the time from 1856 to 1874, is of prominent importance for the development of the Law of Nations. Under the aegis of the principle of nationality, Austria turns in 1867 into the dual monarchy of Austria-Hungary, and Italy as well as Germany becomes united. The unity of Italy rises out of the war of France and Sardinia against Austria in 1859, and Italy ranges henceforth among the Great Powers of Europe. The unity of Germany is the combined result of three wars: that of Austria and Prussia in 1864 against Denmark on account of Schleswig-Holstein, that of Prussia and Italy against Austria in 1866, and that of Prussia and the allied South German States against France in 1870. The defeat of France in 1870 had the consequence that Italy took possession of the Papal States, whereby the Pope disappeared from the number of governing sovereigns.
The United States of America rise through the successful termination of the Civil War in 1865 to the position of a Great Power. Several rules of maritime International Law owe their further development to this war. And the instructions concerning warfare on land, published in 1863 by the Government of the United States, represent the first step towards codification of the Laws of War. In 1864, the Geneva Convention for the amelioration of the condition of soldiers wounded in armies in the field is, on the initiation of Switzerland, concluded by nine States, and in time almost all civilised States became parties to it. In 1868, the Declaration of St. Petersburg, interdicting the employment in war of explosive balls below a certain weight, is signed by many States. Since Russia in 1870 had arbitrarily shaken off the restrictions of Article 11 of the Peace Treaty of Paris of 1856 neutralising the Black Sea, the Conference of London, which met in 1871 and was attended by the representatives of the Powers which were parties to the Peace of Paris of 1856, solemnly proclaimed "that it is an essential principle of the Law of Nations that no Power can liberate itself from the engagements of a treaty, or modify the stipulations thereof, unless with the consent of the contracting Powers by means of an amicable arrangement." The last event in this period is the Conference of Brussels of 1874 for the codification of the rules and usages of war on land. Although the signed code was never ratified, the Brussels Conference was nevertheless epoch-making, since it showed the readiness of the Powers to come to an understanding regarding such a code.
The period 1874-1899.
§ 49. After 1874 the principle of nationality continues to exercise its influence as before. Under its aegis takes place the partial decay of the Ottoman Empire. The refusal of Turkey to introduce reforms regarding the Balkan population led in 1877 to war between Turkey and Russia, which was ended in 1878 by the peace of San Stefano. As the conditions of this treaty would practically have done away with Turkey in Europe, England intervened and a European Congress assembled at Berlin in June 1878 which modified materially the conditions of the Peace of San Stefano. The chief results of the Berlin Congress are:—(1) Servia, Roumania, Montenegro become independent and Sovereign States; (2) Bulgaria becomes an independent principality under Turkish suzerainty; (3) the Turkish provinces of Bosnia and Herzegovina come under the administration of Austria-Hungary; (4) a new province under the name of Eastern Rumelia is created in Turkey and is to enjoy great local autonomy (according to an arrangement of the Conference of Constantinople in 1885-1886 a bond is created between Eastern Rumelia and Bulgaria by the appointment of the Prince of Bulgaria as governor of Eastern Rumelia); (5) free navigation on the Danube from the Iron Gates to its mouth in the Black Sea is proclaimed.
In 1889 Brazil becomes a Republic and a Federal State (the United States of Brazil). In the same year the first Pan-American Congress meets at Washington.
In 1897 Crete revolts against Turkey, war breaks out between Greece and Turkey, the Powers interfere, and peace is concluded at Constantinople. Crete becomes an autonomous half-Sovereign State under Turkish suzerainty with Prince George of Greece as governor, who, however, retires in 1906.
In the Far East war breaks out in 1894 between China and Japan, on account of Korea. China is defeated, and peace is concluded in 1895 at Shimonoseki.[48] Japan henceforth ranks as a Great Power. That she must now be considered a full member of the Family of Nations becomes apparent from the treaties concluded soon afterwards by her with other Powers for the purpose of abolishing their consular jurisdiction within the boundaries of Japan.
[48] See Martens, N.R.G. 2nd Ser. XXI. (1897), p. 641.
In America the United States intervene in 1898 in the revolt of Cuba against the motherland, whereby war breaks out between Spain and the United States. The defeat of Spain secures the independence of Cuba through the Peace of Paris[49] of 1898. The United States acquires Porto Rico and other Spanish West Indian Islands, and, further, the Philippine Islands, whereby she becomes a colonial Power.