The Kingdom of Italy ran on a borrowed Sardinian constitution for 85 years
Italy became a kingdom on 17 March 1861 without writing a new constitution. It simply kept the Statuto Albertino of Sardinia, and that same document stayed formally untouched even while Mussolini turned the country into a dictatorship. A referendum finally ended the monarchy in June 1946.
Victor Emmanuel II of Sardinia was proclaimed king after the Risorgimento stitched several states together, a process driven by the House of Savoy. The new state kept growing: siding with Prussia against Austria in 1866 brought Veneto, and in 1870 Italian troops marched into Rome, ending over a millennium of the popes ruling territory. In 1882 Italy joined Germany and Austria-Hungary in the Triple Alliance, but it coveted Trentino and Trieste, so in World War I it switched to the Allies, who had promised more land under the secret London Pact of 1915. Trieste and Trentino-Alto Adige were annexed in 1919, yet much of what Italy expected never materialised, and it abandoned claims on northern Dalmatia at Rapallo in 1920.
On paper the king held executive power through ministers answerable only to him, and the throne passed down the male line of the Savoys. In practice no monarch could keep a government in office against Parliament, which had an appointed Senate and an elected Chamber of Deputies. Winning a seat outright on the first ballot required half the votes and a quarter of all enrolled voters; otherwise a runoff followed.
After 1918 proportional voting left Parliament divided among Socialists, Catholic populists and liberals. Mussolini took power in 1922, and in 1924 the Acerbo Law handed two-thirds of the seats to whichever party came first, giving the Fascists an outright majority. From 1925 to 1943 the dictatorship operated under the unaltered constitution. The 1929 Lateran Treaties made the Vatican independent, and in 1939 a Chamber of Fasces and Corporations replaced the elected chamber. The royal arms changed too: Mussolini swapped the Savoy lions for lictor's bundles, and the 1890 design returned only after his dismissal.
Invasions of Ethiopia, Spain and Albania in the 1930s led to sanctions and alliances with Germany and Japan. Defeated in World War II, the government surrendered in September 1943, German forces set up a puppet republic in the north, and civil war followed until the monarchy was voted out.
Source: Kingdom of Italy
