Answer:
Austria
Explanation:
Bismarck blamed Austria for preventing the German states to unify and become an important actor in Central Europe.
As a political leader, he created the conditions for a German Confederation to become the German Empire "the Reich".
First, his tactics in making alliances and political movements included seizing German states of Schleswig and Holstein from Denmark in 1864.
Gaining more popularity he declared war with France and after the Franco Prussian war, he was in conditions for becoming powerful enough to contest with Austria.
The Austro Prussian War in 1866 was the final tactic in what is also called "Realpolitik" or politics and use of diplomacy based primarily on considerations of existing circumstances.
With these movements, he pulled Austria out of the scene and made Prussia the leader with the ultimate formation of the German Reich. Reich.
