Until the founding of the nation-state, German history in the 19th century was characterized by multiple political and territorial changes, which had entered a new phase after the end of the Holy Roman Empire of the German Nation from 1806. The Old Reich, a pre- and supranational entity led by the Roman-German emperors - since the middle of the 18th century increasingly characterized by the clashing interests of its two great powers, Austria and the rising Prussia - broke up as a result of the Napoleonic Wars and the founding of the Confederation of the Rhine initiated by France.
The ideas of the French Revolution between 1789 and 1799 and the wars of liberation directed against Napoleon Bonaparte's subsequent hegemonic policy led to nation-state movements in almost all of Europe, including the German-speaking area, with the idea of the nation as the basis for state formation. The Greater German solution was a unified empire including the German settlement areas of the empire of Austria, Prussia and Denmark; the Small German solution was a German empire correspondingly without Austria under Prussian leadership.
However, after the victory of the European powers opposed to France (led by Great Britain, Prussia, Russia and Austria) over Napoleon's armies, the German princes had no interest in a central power that would limit their own rule. Therefore, at the Congress of Vienna in 1815, only the German Confederation was founded, a loose union of those territories that had belonged to the Holy Roman Empire of the German Nation before 1806. The era that followed the Congress of Vienna, referred to in later historiography as the Vormärz, was characterized by the politics of restoration, dominated supranationally by the Austrian state chancellor Clemens Wenzel Prince von Metternich. Within the framework of the so-called Holy Alliance, an alliance initially formed between Austria, Prussia, and Russia, the Restoration was intended to restore, both domestically and intergovernmentally, the balance of power in Europe that had prevailed under the Ancien Régime until the French Revolution.
Nation-state and bourgeois-democratic movements opposed restorationist policies. In the revolutionary year of 1848 in large parts of Central Europe, the March Revolution in the German states also became involved in the revolutionary movement. After the adoption of the Paulskirche constitution, members of the first all-German, democratically elected parliament, the Frankfurt National Assembly, offered the German imperial crown to the Prussian King Frederick William IV as part of the all-German solution. But because the latter refused, citing his "divine right," the attempt to unify the majority of the German states on a constitutional basis failed.
After the ultimately violent suppression of the revolutionary movement of 1848/49, the German Confederation continued to exist until 1866. After a decade of political reaction (reaction era), in which democratic and liberal aspirations were once again suppressed, the first political parties in the modern sense were formed in the German states from the early 1860s. The relationship between Austria and Prussia was characterized by cooperation in the 1850s, then by rivalry again. Different ideas became apparent, for example, at the Frankfurt Fürstentag in 1863: Austria and the central states such as Bavaria wanted to expand the German Confederation as a confederation of states, while Prussia preferred a federal solution. In the German-Danish War of 1864, the two great powers cooperated again, but then fell out over the spoils of Schleswig-Holstein.
Prussian provocation (the invasion of Austrian-administered Holstein) triggered the German War of Prussia against Austria in 1866, in which the armies of Prussia and some northern German states fought together with Italy against the troops of Austria, which was allied with the southern German states, including Baden, Bavaria, Hesse and Württemberg. After the defeat, Austria had to recognize the dissolution of the German Confederation and accept that Prussia founded the North German Confederation with the states north of the Main line as an initially military alliance. This was given a federal constitution in 1867. The southern German states, which had previously been allied with Austria, concluded protection and defense alliances with Prussia.
Triggered by a diplomatic dispute over the Spanish succession, the Franco-PrussianWar began in 1870. The declaration of war came from the French side after Prussian Prime Minister Bismarck had politically exposed France. The southern German states participated in the war and joined the North German Confederation on January 1, 1871. The three wars between 1864 and 1871 are also known as the Wars of German Unification.