Which event marked the completion of the unification of Italy?

The formation of the Kingdom of Italy in 1871 marks the completion of the unification of Italy, which is also known as the Risorgimento. This process involved a series of political and military events that ultimately led to the consolidation of various states and kingdoms on the Italian peninsula into one nation. The establishment of the Kingdom represented the culmination of efforts by key figures such as Giuseppe Garibaldi and Count Camillo di Cavour, who played significant roles in the unification movement.

By 1871, the last significant territory to be incorporated was the Papal States, including Rome. The capture of Rome in 1870 was a crucial step toward the unification, and by declaring Rome the capital in 1871, the Kingdom of Italy was officially established in a unified form. This event signified the end of various regional divisions and the rise of a single Italian state.

The other options refer to significant historical events, but they do not mark the completion of Italian unification directly. The signing of the Treaty of Versailles pertains to World War I and its aftermath, the defeat of the Austrian Empire was a crucial part of the unification process but occurred prior to the final establishment of the Kingdom, and the establishment of the Roman Republic relates