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The unification of Germany into a politically and administratively integrated nation state officially occurred on 18 January 1871 at the Versailles Palace's Hall of Mirrors in France. Princes of the German states gathered there to proclaim Wilhelm of Prussia as Emperor Wilhelm of the German Empire after the French capitulation in the Franco-Prussian War. Unofficially, the transition of most of the German-speaking populations into a federated organization of states occurred over nearly a century of experimentation. Unification exposed several glaring religious, linguistic, and cultural differences between and among the inhabitants of the new nation, suggesting that 1871 really only represents one moment in a continuum of the larger unification processes. Historians debate whether or not Otto von Bismarck, the Minister President of Prussia, had a master-plan to expand the North German Confederation of 1866 to include the remaining independent German states into a single entity, or whether he simply sought to expand the power of the Kingdom of Prussia. They conclude that factors in addition to the strength of Bismarck's Realpolitik led a collection of early modern polities to reorganize political, economic, military and diplomatic relationships in the 19th century. By establishing a Germany without Austria, the political and administrative unification in 1871 at least temporarily solved the problem of German dualism.