1946 Italian institutional referendum in the context of "Regia Marina"

The Kingdom of Italy was proclaimed with a normative act of the Savoyard Kingdom of Sardinia — the law 17 March 1861, n. 4761 — with which Victor Emmanuel II assumed for himself and for his successors the title of King of Italy. 17 March is commemorated annually by the anniversary of the unification of Italy, a national holiday established in 1911 on the occasion of the 50th anniversary, and also celebrated, in the Republican era, in 1961 and 2011.

The Kingdom of Italy (Italian: Regno d'Italia, pronounced [ˈreɲɲo diˈtaːlja]) was a unitary state that existed from 17 March 1861, when Victor Emmanuel II of Sardinia was proclaimed King of Italy, until 10 June 1946, when the monarchy was abolished, following civil discontent that led to an institutional referendum on 2 June 1946. This resulted in a modern Italian Republic. The kingdom was established through the unification of several states over a decades-long process, called the Risorgimento. That process was influenced by the Savoy-led Kingdom of Sardinia, which was one of Italy's legal predecessor states. In 1882 it became a colonial empire, establishing the Italian Empire.

In 1866, Italy declared war on Austria in alliance with Prussia and, upon its victory, received the region of Veneto. Italian troops entered Rome in 1870, ending more than one thousand years of Papal temporal power. In the last two decades of the 19th century, Italy developed into a colonial power, and in 1882 it entered into a Triple Alliance with the German Empire and the Austro-Hungarian Empire, following strong disagreements with France about their respective colonial expansions. Although relations with Berlin became very friendly, the alliance with Vienna remained purely formal, due in part to Italy's desire to acquire Trentino and Trieste from Austria-Hungary. As a result, Italy accepted the British invitation to join the Allied Powers during World War I, as the western powers promised territorial compensation (at the expense of Austria-Hungary) for participation that was more generous than Vienna's offer in exchange for Italian neutrality. Victory in the war gave Italy a permanent seat in the Council of the League of Nations, but it did not receive all the territories it was promised.

The House of Savoy (Italian: Casa Savoia, French: Maison de Savoie) is a royal house (formally a dynasty) of Franco-Italian origin that was established in 1003 in the historical region of Savoy, which was originally part of the Kingdom of Burgundy and now lies mostly within southeastern France. Through gradual expansions, the family grew in power, first ruling the County of Savoy, a small Alpine county northwest of Italy, and later gaining absolute rule of the Kingdom of Sicily. During the years 1713 to 1720, they were handed the Kingdom of Sardinia and would exercise direct rule from then onward as Piedmont–Sardinia, which was the legal predecessor state of the Kingdom of Italy and the Italian Empire, which in turn are the predecessors of the present-day Italian Republic.

From rule of a region on the French–Italian border, by the time of the abolition of monarchy in Italy, the dynasty's realm grew to include nearly all of the Italian peninsula. Through its junior branch of Savoy-Carignano, the House of Savoy led the Italian unification in 1861, and ruled the Kingdom of Italy until 1946. They also briefly ruled the Kingdom of Spain during the 19th century. The Savoyard kings of Italy were Victor Emmanuel II, Umberto I, Victor Emmanuel III, and Umberto II. Umberto II reigned for only a few weeks, as the last king of Italy, before being deposed following the 1946 Italian institutional referendum, after which the Italian Republic was proclaimed.

The history of the Italian Republic concerns the events relating to the history of Italy that have occurred since 1946, when Italy became a republic after the 1946 Italian institutional referendum. The Italian republican history is generally divided into two phases, the First and Second Republic.

After the fall of the Fascist regime in Italy and the end of World War II, Italian politics and society were dominated by Christian Democracy (DC), a broad-based Christian political party, from 1946 to 1994. From the late 1940s until 1991, the opposition was led by the Italian Communist Party (PCI). Christian Democracy governed uninterrupted during this period, dominating every cabinet and providing nearly every prime minister. It governed primarily with the support of an array of minor parties from the centre-left to the centre-right, including the Italian Socialist Party (PSI), Italian Democratic Socialist Party (PSDI), Italian Republican Party (PRI), and Italian Liberal Party (PLI), and even far-right parties like the Italian Social Movement (MSI). The Communist Party was excluded entirely from government, with the partial exception of the short-lived Historic Compromise, in which the PCI provided external support to a DC minority government from 1976 to 1979.

The Constitution of the Italian Republic (Italian: Costituzione della Repubblica Italiana) was ratified on 22 December 1947 by the Constituent Assembly, with 453 votes in favour and 62 against, before coming into force on 1 January 1948, one century after the previous Constitution of the Kingdom of Italy had been enacted. The text, which has since been amended sixteen times, was promulgated in an extraordinary edition of Gazzetta Ufficiale on 27 December 1947.

The Constituent Assembly was elected by universal suffrage on 2 June 1946, on the same day as the referendum on the abolition of the monarchy was held, and it was formed by the representatives of all the anti-fascist forces that contributed to the defeat of Nazi and Fascist forces during the liberation of Italy. The election was held in all Italian provinces, except the provinces of Bolzano, Gorizia, Trieste, Pola, Fiume and Zara, located in territories not administered by the Italian government but by the Allied authorities, which were still under occupation pending a final settlement of the status of the territories (in fact in 1947 most of these territories were then annexed by Yugoslavia after the Paris peace treaties of 1947, such as most of the Julian March and the Dalmatian city of Zara).

Luigi Numa Lorenzo Einaudi (Italian: [luˈiːdʒi eiˈnaudi]; 24 March 1874 – 30 October 1961) was an Italian politician, economist and banker who served as President of Italy from 1948 to 1955 and is considered one of the founding fathers of the Italian Republic.

The Royal Italian Army (Italian: Regio Esercito, lit. 'Royal Army', RE) was the land force of the Kingdom of Italy, established with the proclamation of the Kingdom of Italy. During the 19th century Italy started to unify into one country, and in 1861 Manfredo Fanti signed a decree creating the Army of the Two Sicilies. This newly created army's first task was to defend its territorial gains against Legitimists in southern Italy, who remained loyal to Francis II of the Two Sicilies. The Army of the Two Sicilies also waged what many modern historians now consider a civil war against outlaws and Bourbonist guerrillas, such as the famous Michelina Di Cesare, and against other Italian states' armies during the continuing wars of unification. After the monarchy ended in 1946, the army changed its name to become the modern Italian Army (Esercito Italiano).

Within the Royal Italian Army were the elite mountain military corporals, the Alpini. The Alpini, which remain in existence today, are the oldest active mountain infantry in the world. Their original mission was to protect and secure Italy's northern mountain border that aligns with France and Austria. This group emerged in World War I when a three-year campaign was fought against the Austro-Hungarian Kaiserjäger and the German Alpenkorps. In World War II, the Alpini fought alongside Axis forces in the Eastern Front as well as the Balkans campaign.