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.
Milan
On 18 March 1848, the Milanese rebelled against Austrian rule, during the so-called "Five Days" (), and Field Marshal Radetzky was forced to withdraw from the city temporarily. The Kingdom of Sardinia stepped in to help the insurgents; a plebiscite held in Lombardy decided in favour of unification with Sardinia. However, after defeating the Sardinian forces at Custoza on 24 July, Radetzky was able to reassert Austrian control over Milan and northern Italy. A few years on, however, Italian nationalists again called for the removal of Austria and Italian unification. Sardinia and France formed an alliance and defeated Austria at the Battle of Solferino in 1859. Following this battle, Milan and the rest of Lombardy were incorporated into the Kingdom of Sardinia, which soon gained control of most of Italy and in 1861 was rechristened as the Kingdom of Italy.