Final answer:
Otto von Bismarck, through Realpolitik and strategic warfare, was instrumental in the German unification under Prussian king Wilhelm I.
Explanation:
Otto von Bismarck, a German politician and chancellor of Prussia, played a crucial role in bringing about German unification. Through his leadership, Bismarck utilized a policy of Realpolitik, conducted successful wars against Denmark, Austria, and France, and formed alliances to unify the German states under the Prussian king Wilhelm I. His pragmatic and strategic approach to politics paved the way for the establishment of the German Empire in 1871.
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