Bismarck's next goal was to get the German states located in the south to join the German Confederation.
In 1870 Otto von Bismarck tricked France and Prusia to go war with each other. During the Franco-Prussian War the southern German states came to the side of Prussia and France lost the war.
On January 21, 1871, Otto von Bismarcknd and Prussia took possession of the German Empire. Prussian King Wilhelm took control of Germany.
The balance of power that was created by the Congress of Vienna 1815 was put in place as an attempt to stabalize the political and militalry forces of Europe.
The German Unification made Germany stronger than most of the other countries that were close to Germany.