[Verginius Rufus]

Actually, German unification was completed during the Franco-Prussian War: Wilhelm I was proclaimed German emperor on January 18, 1871, at Versailles, while the German armies were besieging Paris. The French National Assembly accepted the terms of peace March 1, 1871, and the peace treaty was signed May 10, 1871.

[Burkeman1]

Perhaps De facto - But I think De jure unification wasn't achieved until Bismark in the 1880's somtime.