Otto von Bismarck was the 'Iron Chancellor' who unified Germany through 'blood and iron' and then dominated European diplomacy for two decades. A Prussian Junker, Bismarck served as Prussia's minister-president before engineering three wars that created the German Empire with Prussia at its head.
Bismarck's genius was Realpolitik—politics based on practical calculation rather than ideology. He provoked wars with Denmark, Austria, and France precisely when conditions favored Prussia, creating a unified Germany in 1871. As Chancellor, he built an intricate alliance system to isolate France and maintain peace—a balance that collapsed after his dismissal.
Domestically, Bismarck pioneered the welfare state—accident insurance, health insurance, old-age pensions—to undercut socialist appeal. He fought Catholics (Kulturkampf) and socialists alike. His constitution balanced parliamentary forms with authoritarian substance. Dismissed by Kaiser Wilhelm II in 1890, Bismarck's departure destabilized the system he created. His legacy includes German unification, modern welfare states, and the Realpolitik tradition in international relations.