The Perfect Fusion () was the 1847 act of the Savoyard king Charles Albert of Sardinia which abolished the administrative differences between the mainland states (Savoy and Piedmont) and the island of Sardinia, in a fashion similar to the Nueva Planta decrees between the Crown of Castile and the realms of the Crown of Aragon between 1707 and 1716 and the Acts of Union between Great Britain and Ireland in 1800. The once Iberian Kingdom of Sardinia had become a possession of the House of Savoy in 1720, and it had continued to be ruled as during the ages of the Spanish Empire. Although the Sardinian populace had been showing hostility against the new Piedmontese rulers since the failed insurrection in 1794, the island's separate status from the Mainland became a problem for the local notables from two major cities of Cagliari and Sassari when liberal reforms began to be put in force in Turin, and some of them started to see their own legal system as a handicap more than a privilege; a minority of other Sardinian notables, like Giovanni Battista Tuveri and Federico Fenu, were not in favour of the idea, fearing that further moves toward the centralisation of the Savoy-led Kingdom might have followed thereafter. King Charles Albert eventually solved the problem by transforming all his dominions into a single, centralized state. A new legal system entered into force in Sardinia, and the last viceroy, Claudio Gabriele de Launay, left Cagliari on 4 March 1848. The island was divided into three provinces ruled by their prefects, following the system already used in Piedmont since 1815. The ultimate goal of the unionist movement was assimilationist, for it set about, in the words of the Pietro Martini, "to transplant, without any reserves and obstacles, the culture and civilization of the Italian Mainland to Sardinia, and thereby form a single civil family under a Father better than a King, the great Charles Albert". Moreover, the fusion was supposed to spur commercial development in Sardinia and, by 1861, according to William S. Craig (then British consul-general at Cagliari), increase the Kingdom's importance; however, the kingdom's insular part lost what little autonomy it had previously had in the process, as well as its historical title of "nation", as it had been referred to for centuries, and illustrated by the Kingdom's national anthem; in this regard, the Fusion provoked a shift in terminology,