Question

fter centuries of being passed between Genoa, France and Sardinia what European country was finally granted sovereignty in 1861?

Answer 1

Italy finally had its independence last April 11. 1861 after the Third Italian War with the Austrian Empire. The Austrian-Italian Treaty was the formal confirmation of Italy's territory. 

This event received recognition by the United States. 
I hope this answered your given question.

Answer 2

Answer:

Monaco was granted sovereignty in 1861

Explanation:

Assigned as a protectorate of the Kingdom of Sardinia in 1815 by the Congress of Vienna after Napoleon's destruction, Monaco's power was affirmed by the Franco-Monegasque Treaty of 1861. France acknowledged the presence of the Principality of Monaco however added 95% of its previous territory. Monaco's military safeguard from that point forward has been the responsibility of France.