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.
Kingdom of Sardinia
Although the ""Kingdom of Sardinia and Corsica"" could be said to have started as a questionable and extraordinary "de jure" state in 1297, its "de facto" existence began in 1324 when, called by their allies of the Giudicato di Arborea in the course of war with the Republic of Pisa, James II seized the Pisan territories in the former states of Cagliari and Gallura and asserted his papally approved title. In 1347 CE Aragon made war on landlords of the Doria House and the Malaspina House, who were citizens of the Republic of Genoa, which controlled most of the lands of the former Logudoro state in north-western Sardinia, including the city of Alghero and the semiautonomous Republic of Sassari, and added them to its direct domains.