Unification of Italy

For fourteen centuries, the Italian peninsula had been carved into competing kingdoms, duchies, and papal territories—a fact so entrenched that Metternich dismissed Italy as merely a "geographic expression." That changed with startling speed between 1859 and 1861, when Camillo Cavour, the Piedmontese prime minister, orchestrated a campaign of diplomatic intrigue and calculated wars that brought most of the peninsula under a single crown.

Cavour's strategy was methodical: secure French support by ceding Savoy and Nice, then wage war against Austria to seize Lombardy and Venetia. The 1859 Franco-Piedmontese victory at Solferino opened the door, though Cavour's plans faced a complication named Giuseppe Garibaldi. The revolutionary general, commanding his volunteer "Thousand" (actually about 1,100 men), invaded Sicily in May 1860 and swept north through the Two Sicilies with bewildering speed. Rather than compete with Garibaldi's popularity, Cavour outmaneuvered him—orchestrating a plebiscite in October 1860 that transferred the southern territories to the Piedmontese crown, sidelining Garibaldi's republican ambitions in favor of monarchical unity.

On March 17, 1861, the Italian parliament declared Victor Emmanuel II king of a unified Italy. The speed of consolidation was extraordinary: in less than two years, a peninsula fractured since the Middle Ages had become one state. The exceptions mattered, though. Rome, held by papal forces and French troops, remained outside Italian borders until 1870. Venetia, still Austrian, wouldn't join until 1866. But the core of the nation was forged—not through popular revolution alone, as Giuseppe Mazzini had envisioned, but through the calculated statecraft of a aristocrat from Turin.

The unification revealed the limits of romantic nationalism. Garibaldi had imagined a unified Italy sprung from democratic passion; Cavour delivered one built on realpolitik and royal authority. Mazzini, the third pillar of the movement, spent his later years disappointed by the monarchy that crowned his dream. Yet Italy was united, the peninsula's fragmentation had ended, and Europe had a new major power—all before most Europeans had adjusted to the shock of it.