Imperial Germany (1871–1918), with the dominant Kingdom of Prussia in blue

Following the fall of Napoleon, the Congress of Vienna convened in 1814 and founded the German Confederation (Deutscher Bund), a loose league of 39 sovereign states. Disagreement with restoration politics partly led to the rise of liberal movements, followed by new measures of repression by Austrian statesman Metternich. The Zollverein, a tariff union, furthered economic unity in the German states.[27] National and liberal ideals of the French Revolution gained increasing support among many, especially young, Germans. In the light of a series of revolutionary movements in Europe, which established a republic in France, intellectuals and commoners started the Revolutions of 1848 in the German states. King Frederick William IV of Prussia was offered the title of Emperor, but with a loss of power; he rejected the crown and the proposed constitution, leading to a temporary setback for the movement.[28]


Imperial Germany (1871–1918), with the dominant Kingdom of Prussia in blue
Conflict between King William I of Prussia and the increasingly liberal parliament erupted over military reforms in 1862, and the king appointed Otto von Bismarck the new Minister President of Prussia. Bismarck successfully waged war on Denmark in 1864. Prussian victory in the Austro-Prussian War of 1866 enabled him to create the North German Confederation (Norddeutscher Bund) and to exclude Austria, formerly the leading German state, from the federation's affairs. After the French defeat in the Franco-Prussian War, the German Empire was proclaimed in 1871 in Versailles, uniting all scattered parts of Germany except Austria (Kleindeutschland, or "Lesser Germany").
With almost two-thirds of its territory and population, Prussia was the dominating constituent of the new state; the Hohenzollern King of Prussia ruled as its concurrent Emperor, and Berlin became its capital.[28] In the Gründerzeit period following the unification of Germany, Bismarck's foreign policy as Chancellor of Germany under Emperor William I secured Germany's position as a great nation by forging alliances, isolating France by diplomatic means, and avoiding war. Under Wilhelm II, however, Germany, like other European powers, took an imperialistic course leading to friction with neighbouring countries. As a result of the Berlin Conference in 1884 Germany claimed several colonies including German East Africa, German South-West Africa, Togo, and Cameroon.[29] Most alliances in which Germany had previously been involved were not renewed, and new alliances excluded the country.[30]
The assassination of Austria's crown prince on 28 June 1914 triggered World War I. Germany, as part of the Central Powers, suffered defeat against the Allies in one of the bloodiest conflicts of all time. An estimated two million German soldiers died in World War I.[31] The German Revolution broke out in November 1918, and Emperor Wilhelm II and all German ruling princes abdicated. An armistice ended the war on 11 November, and Germany was forced to sign the Treaty of Versailles in June 1919. The treaty was perceived in Germany as a humiliating continuation of the war, and is often cited as an influence in the rise of Nazism