The Prime Minister of ‘Sardinia-Piedmont’, Cavour set up an alliance with France in 1858 during the Italian Unification.
Explanation:
During the ‘Italian Unification’ in 1858 the Prime Minister’s interest in politics had increased. So he thought to modernize the Piedmont politically as well as economically. Since France was a potential ally at hand that too immediately with a benefit in hindsight.
The other reason of this alliance was that in the ‘Crimean War’ against ‘Russia’, France provided immediate help than England. Therefore, Cavour formed the league with France, and used diplomacy and united the northern Italian states.