The League of the Three Emperors or Union of the Three Emperors was an alliance between the German, Russian and Austro-Hungarian Empires, from 1873 to 1887. Chancellor Otto von Bismarck took full charge of German foreign policy from 1870 to his dismissal in 1890. His goal was a peaceful Europe, based on the balance of power. Bismarck feared that a hostile combination of Austria-Hungary, France, and Russia would crush Germany. If two of them were allied, then the third would ally with Germany only if Germany conceded excessive demands. The solution was to ally with two of the three. In 1873 he formed the League of the Three Emperors, an alliance of the Kaisers of Germany and Austria-Hungary and the Tsar of Russia. Together they would control Eastern Europe, making sure that restive ethnic groups such as the Poles were kept in control. It aimed at neutralizing the rivalry between Germany's two neighbors by an agreement over their respective spheres of influence in the Balkans and at isolating Germany's enemy, France. The Balkans posed a more serious issue, and Bismarck's solution was to give Austria predominance in the western areas, and Russia in the eastern areas.

The German Empire, also referred to as Imperial Germany, the Second Reich or simply Germany, was the period of the German Reich from the unification of Germany in 1871 until the November Revolution in 1918, when the German Reich changed its form of government from a monarchy to a republic.