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.
Italians
During the subsequent Swabian rule under the Holy Roman Emperor Frederick II, who spent most of his life as king of Sicily in his court in Palermo, Muslims was progressively eradicated until the massive deportation of the last Muslims of Sicily. As a result of Arab expulsion, many towns across Sicily were left depopulated. By the 12th century, Swabian kings granted immigrants from northern Italy (particularly Piedmont, Lombardy and Liguria), Latium and Tuscany in central Italy, and French regions of Normandy, Provence and Brittany (all collectively known as "Lombards".) settlement into Sicily, re-establishing the Latin element into the island, a legacy which can be seen in the many Gallo-Italic dialects and towns found in the interior and western parts of Sicily, brought by these settlers. It is believed that the Lombard immigrants in Sicily over a couple of centuries were a total of about 200,000.