Kingdom of Sardinia
On 17 March 1861, law no. 4671 of the Sardinian Parliament proclaimed the Kingdom of Italy, so ratifying the annexations of all other Apennine states, plus Sicily, to the Kingdom of Sardinia. The institutions and laws of the Kingdom were quickly extended to all of Italy, abolishing the administrations of the other regions. Piedmont became the most dominant and wealthiest region in Italy and the capital of Piedmont, Turin, remained the Italian capital until 1865, when the capital was moved to Florence. But many revolts exploded throughout the peninsula, especially in southern Italy, and on the island of Sicily, because of the perceived unfair treatment of the south by the Piedmontese ruling class. The House of Savoy ruled Italy until 1946 when Italy was declared a republic by referendum. In this referendum the southern regions, including Sardinia, voted overwhelmingly in favor of the House of Savoy, with the results being 63.8% in favor of maintaining the monarchy.
Southern Italy
After Napoleon's defeat, King Ferdinand IV was restored by the Congress of Vienna of 1815 as Ferdinand I of the Two Sicilies. He established a concordat with the Papal States, which previously had a claim to the land. There were several rebellions on the island of Sicily against the King Ferdinand II but the end of the kingdom was only brought about by the Expedition of the Thousand in 1860, led by Garibaldi, an icon of the Italian unification, with the support of the House of Savoy and their Kingdom of Sardinia. The expedition resulted in a striking series of defeats for the Sicilian armies against the growing troops of Garibaldi. After the capture of Palermo and Sicily, he disembarked in Calabria and moved towards Naples, while in the meantime the Piedmontese also invaded the Kingdom from the Marche. The last battles fought were that of the Volturnus in 1860 and the siege of Gaeta, where King Francis II had sought shelter, hoping for French help, which never came. The last towns to resist Garibaldi's expedition were Messina (which capitulated on 13 March 1861) and Civitella del Tronto (which capitulated on 20 March 1861). The Kingdom of the Two Sicilies was dissolved and annexed to the new Kingdom of Italy, founded in the same year.