Cooperation and rivalry between Austria and Prussia up to 1866
Austria and Prussia were the most powerful German states in the Holy Roman Empire by the 18th and 19th centuries and had engaged in a struggle for supremacy among smaller German kingdoms. The rivalry was characterized by major territorial conflicts and economic, cultural, and political aspects. Therefore, the rivalry was an important element of the German question in the 19th century.
The German term is Deutscher Dualismus (literally German dualism), which does not cover only rivalry but also cooperation, for example in the Napoleonic Wars. Indeed, both powers did jointly dominate the German Confederation which functioned only in times of cooperation (1815–1848 and 1851–1859). They still fought on the same side (against Denmark) in the Second Schleswig War (1864).
After 1866 (North German Confederation) and 1871, the new German nation state was dominated by Prussia. As Austria (or Austria-Hungary, since 1867) no longer struggled over the hegemony in Germany, the term Deutscher Dualismus became meaningless. Germany and Austria-Hungary soon became close allies, as proven by the Zweibund of 1879. Both countries were the main Central Powers during World War I (1914–1918). After that war, Austria-Hungary fell apart, and Germany became a republic.
After the Protestant Reformation, the Catholic Habsburgs had to accept the 1555 Peace of Augsburg and failed to strengthen their Imperial authority in the disastrous Thirty Years' War. Upon the 1648 Peace of Westphalia, Austria had to deal with the rising Brandenburg-Prussian power in the north, that replaced the Electorate of Saxony as the leading Protestant estate. The efforts made by the "Great Elector" and the "Soldier-king" Frederick William I had created a progressive state with a highly effective Prussian Army that, sooner or later, had to collide with the Habsburg claims to power.[3]
Nevertheless, the conquest of Prague failed and moreover, the king had to deal with Russian forces attacking East Prussia while Austrian troops entered Silesia. His situation worsened when Austrian and Russian forces united to inflict a crushing defeat on him at the 1759 Battle of Kunersdorf. Frederick, on the brink, was saved by the discord among the victors in the "Miracle of the House of Brandenburg", when Empress Elizabeth of Russia died on 5 January 1762 and her successor Peter III concluded peace with Prussia. By the 1763 Treaty of Hubertusburg, Austria, for the third time, had to acknowledge the Prussian annexations. The usurper kingdom had prevailed against the European great powers and would play a vital future role in the "Concert of Europe".[8]
Austria and Prussia both would fight France in the Napoleonic Wars; after their conclusion, the German states were reorganized into a more unified 37 separate states of the German Confederation. German nationalists began to demand a unified Germany, especially by 1848 and its revolutions. They were conflicted over the best nation-state to accomplish this, a question that became known as the German question.[9] The "Lesser Germany" (Kleindeutschland) solution favored Protestant Prussia annexing all the German states except Austria, while "Greater Germany" (Grossdeutschland) favored Catholic Austria taking control of the separate German states. The Schleswig-Holstein Question also became tied up in the debate; the Second Schleswig War saw Denmark lose to the combined forces of Austria and Prussia, but Prussia would later gain full control of the province after the Austro-Prussian War, thus saw Austria being excluded from Germany. After the Franco-Prussian War, Germany was unified under Prussia to become the German Empire in 1871, and the rivalry is often seen as subsiding after the Congress of Berlin in 1878. Germany, led by Prussia, had become the superior power to Austria-Hungary.[10]