The Habsburg monarchy, and

Foreign policy, 1870–90
Until his resignation in 1890, Bismarck had a relatively free hand in the conduct of foreign policy. After three successful wars, he saw his task as promoting peace and gaining time so that a powerful German Empire in the middle of Europe would come to be accepted as natural rather than as an interloper. The Prussian victories had led to great insecurity among the Continental powers, who now reformed their armies in imitation of Germany and maneuvered for defensive alliances so they would not find themselves isolated in the event of war. Bismarck’s two areas of concern were the Balkans—where the disintegration of the Turkish Ottoman Empire could easily lead to conflict between Habsburg-ruled Austria-Hungary and Russia—and France, which desired revenge against the German victors. Each might spark a general European conflagration that would inevitably involve Germany.
Bismarck’s most important diplomatic objective was to prevent France from allying itself with either Austria-Hungary or Russia to create a coalition of enemies in both the east and the west. In 1873 he negotiated the Three Emperors’ League with Russia and Austria-Hungary. The league collapsed in the mid-1870s when rebellion broke out in Turkey’s Slavic provinces. In 1877 Russia declared war on Turkey, leading both Britain and Austria-Hungary to express serious concern about Russia’s expansionist war aims. When Russia forced Turkey to cede considerable territory in the Treaty of San Stefano, Bismarck called for an international conference to reconsider the peace treaty and to forestall another military conflict. At the Congress of Berlin in 1878, Bismarck played the role of honest broker among the powers. Russia reluctantly accepted more modest territorial gains, and tensions dissipated.
But a conflagration had barely been avoided. Soon after the conference, Bismarck negotiated an alliance with Austria-Hungary (1879), which remained in effect through World War I. While Bismarck did not intend to do so, he had tied the fate of the youthful German Empire to the aged multinational empire that faced continuous problems from its many ethnic minorities. The chancellor had clearly opted for the Dual Monarchy over Russia should a war break out. The alliance gave him leverage in Vienna, and he steadfastly used it to prevent a war over the Balkans. He chose Austria-Hungary because he feared that its dissolution would lead to Russian hegemony over the empire’s Polish, Czech, and other Slavic provinces. In addition, seven million Austro-German Catholics might seek admission to the German Empire, leading to a strengthening of the hated Centre Party.
Having a solid ally, Bismarck demonstrated his virtuosity by negotiating a revived Three Emperors’ League in 1881. He now had influence in St. Petersburg as well as in Vienna to prevent a conflict over the Balkans. In 1882 Italy, fearing French hostility, joined the Dual Alliance with Austria-Hungary, making it into the Triple Alliance. On the surface Bismarck had triumphed. France had no allies for a war of revenge, and the alliance with both Austria-Hungary and Russia gave him influence with the two major adversaries in the Balkans.
The transient nature of this artistry soon became apparent. A crisis in Bulgaria inflamed Russo-Austrian relations, leading to the breakup of the revived league. Once again a war was avoided with Bismarck’s intervention, but Austria-Hungary and Russia could no longer patch up their differences. Bismarck negotiated a separate Reinsurance Treaty with the Russian tsar in 1887. Nevertheless, France and Russia began courting each other before Bismarck left office.
Between 1870 and 1890 Bismarck earned the respect of European leaders for his pacific policies. Apart from a few colonial additions in the mid-1880s, Germany under his guidance acted as a satiated power. The question remained whether this burgeoning industrial power led by the Junker and industrial elites would continue this policy while the other Western powers carved out world empires.