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. The "Lesser Germany" ("Kleindeutschland") solution favored Protestant Prussia annexing all the German states except Austria, while "Big 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.