With the Perfect fusion in 1848, the confederation of states powered by the Savoyard kings of Sardinia became a unitary and constitutional state and moved to the Italian Wars of Independence for the Unification of Italy, that were led for thirteen years. In 1861, being Italy united by a debated war campaign, the parliament of the Kingdom of Sardinia decided by law to change its name and the title of its king to Kingdom of Italy and King of Italy. Most Sardinian forests were cut down at this time, in order to provide the Piedmontese with raw materials, like wood, used to make railway sleepers on the mainland. The extension of the primary natural forests, praised by every traveller visiting Sardinia, would in fact be reduced to 1/5 of their original number, being little more than 100.000 hectares at the end of the century.