The document summarizes the process of Italian unification from the 1815 Congress of Vienna until 1870. Key figures like Cavour, Garibaldi, and Mazzini worked towards unifying the Italian states against Austrian rule. Through the Austro-Sardinian War of 1859, plebiscites to join Piedmont, the Austro-Prussian War of 1866, and Garibaldi's conquest of the Kingdom of Two Sicilies, most Italian states were united by 1860 except for the Papal States and Venetia. French troops withdrew from Rome in 1870 after the Franco-Prussian War, allowing Italy to take the city and complete unification.