The Kingdom of Italy was a unitary state that existed from 17 March 1861, when Victor Emmanuel II of Sardinia was proclaimed King of Italy, until 18 June 1946, when the monarchy was abolished, following civil discontent that led to an institutional referendum on 2 June, resulting in the establishment of the 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.