How did cavour's appintment as prime minister of the kingdom of sardinia the italian unification

Italian unification (Italian: Unità d'Italia [uniˈta ddiˈtaːlja]), or the Risorgimento ([risordʒiˈmento], meaning "the Resurgence"), was the political and social movement that consolidated different states of the Italian peninsula into the single state of the Kingdom of Italy in the 19th century. The process began in 1815 with the Congress of Vienna and was completed in 1871 when Rome became the capital of the Kingdom of Italy

The answer should be bz