Final answer:
Count Cavour proposed an alliance between France and Sardinia against Austria in the mid-19th century, leading to the Franco-Sardinian victory in the Second Italian War of Independence.
Step-by-step explanation:
The alliance between France and Sardinia against Austria was proposed by Count Camillo Benso di Cavour, the Prime Minister of Sardinia, in the mid-19th century. Cavour believed that by uniting with France, Sardinia could strengthen its position and challenge Austrian control in Italy. This alliance eventually led to the Franco-Sardinian victory over Austria in the Second Italian War of Independence in 1859.
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