The Perfect Fusion (Italian: Fusione perfetta) was the 1847 act of King Charles Albert of Savoy which abolished the administrative differences between the constituent countries of the Kingdom of Sardinia, especially the governmental division between Sardinia and the mainland.
Kingdom of Sardinia had become a possession of the House of Savoy since 1720, and it had continued to be ruled as during the ages of the Spanish Empire.
This situation became a problem for Sardinian notable people when liberal reforms began to be put in force in Turin, and Sardinians started to look at their separate legal system as a handicap more than a privilege. King Charles Albert resolved the problem transforming his dominions in a single, centralized state.
A new legal system entered in 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, as had happened in Piedmont in 1815.
The effects of the fusion were to spur commercial development in Sardinia and, by 1861, according to William S. Craig, then the British consul-general at Cagliari, increase the island's importance.[1]