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.
Italy
An Allied invasion of Sicily began in July 1943, leading to the collapse of the Fascist regime and the fall of Mussolini on 25 July. Mussolini was deposed and arrested by order of King Victor Emmanuel III in co-operation with members of the Grand Council of Fascism, who lost faith in him for having led Italy to ruin by allying with Germany. On 8 September, Italy signed the Armistice of Cassibile, ending its war with the Allies. The Germans helped by the Italian fascists shortly succeeded in taking control of northern and central Italy. The country remained a battlefield for the rest of the war, as the Allies were slowly moving up from the south.