Italy is generally considered to have unified in 1861, when the Kingdom of Italy was officially proclaimed on 17 March.

Quick Scoop: Key Dates

  • 17 March 1861: Proclamation of the Kingdom of Italy under Victor Emmanuel II; this is the date usually given when people ask “when did Italy unify.”
  • 1866: Venetia (Veneto) was added after Austria’s defeat, bringing more of the Italian peninsula into the new state.
  • 20 September 1870: Italian troops captured Rome from the Papal States, often seen as the completion of political unification.
  • 1871: Rome officially became the capital of the Kingdom of Italy, symbolically closing the Risorgimento era.

Why the Date Can Be Confusing

Historians sometimes distinguish between:

  • Formal unification : the 1861 proclamation of the Kingdom of Italy, when most Italian states were brought under one crown.
  • Full territorial unification : 1870–1871, once Rome and the remaining Papal territories were annexed and Rome became capital.

So, for a simple answer: Italy unified in 1861, but the process only fully wrapped up with the capture of Rome in 1870 and its designation as capital in 1871.