Piedmont-Sardinia was a historical state in Italy that existed from 1720 to 1861. It was formed when the Kingdom of Sardinia was united with the Duchy of Savoy and the region of Piedmont. This state played a crucial role in the unification of Italy, serving as a political and military center during the Risorgimento. The capital of Piedmont-Sardinia was Turin, which became an important cultural and economic hub. The monarchy of the House of Savoy ruled the region, and their influence helped shape modern Italy. The state was instrumental in the establishment of the Kingdom of Italy in 1861.