Italy Unification Timeline By ruffer2000 Apr 1, 1800 Italy is in nation states Apr 1, 1852 Camour first is prime minister and starts to help country Apr 1, 1861 Italy becomes a united Kingdom Apr 1, 1862 Camillo Di Cavour becomes prime minister permanately Jul 16, 1866 Austrian Empire has fallen in the Austrian Prussian war. May 10, 1870 French troops are out of Rome.