Input (grade 13): The formal 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.
Output (grade 9): Unification took place on 18 January 1871. At the conclusion of the Franco-Prussian War, the German princes proclaimed the German nation in Versailles, France, at the Hall of Mirrors.