Summary
Whereas Camillo di Cavour directed Italian unification, a Junker (the Prussian name for an aristocratic landowner from old Prussia in the east) named Otto von Bismarck pushed German unification through "blood and iron" and skillful understanding of realpolitik. As the map of central Europe stood in 1850, Prussia competed with Austria for dominance over a series of small principalities fiercely keen on maintaining their independence and distinctive characteristics. Prussia proper stretched from modern-day Lithuania to central Germany. Prussia also controlled the German lands around the Rhine River in the west. In between, from Denmark to Switzerland, lay small provinces that Bismarck needed to incorporate under the Prussian crown to create a viable German Empire.
In 1862, Bismarck reorganized the Prussian army and improved training in preparation for war. In 1864, he constructed an alliance with Austria to fight Denmark over Denmark's southern provinces of Schleiswig and Holstein. Prussia received Schleiswig while Austria administered Holstein. That situation, however, could not stand for long, as Austrian Holstein was now surrounded by Prussian lands. Bismarck provoked a conflict with Austria over an unrelated border dispute and in the subsequent Seven Weeks' War--named for its brevity--Prussia crushed the collapsing Austrian army. The peace settlement transferred Holstein to Prussia and forced Austria to officially remove itself from all German affairs.
With Austria out of Bismarck's way, his next obstacle was the skepticism of the southern provinces. Overwhelmingly Catholic and anti-militaristic, the southern provinces doubted Prussia's commitment to a united Germany of all provinces. Prussia's Protestantism and historic militarism made the gulf between north and south quite serious. Therefore, Bismarck turned to realpolitik to unite the Germanic provinces by constructing a war against a common enemy. In 1870,