Who was the responsible for the expansion of Prussia?

The expansion of Prussia in the 19th century was largely attributed to Otto Von Bismarck, the Prussian Chancellor. His strategic diplomacy and military conflicts, particularly the Austro-Prussian War of 1866 and the Franco-Prussian War of 1870-1871, facilitated the unification of various German states under Prussian leadership. Bismarck's policies and realpolitik played a crucial role in establishing Prussia as a dominant power in Germany and Europe.