Answer :

joanna201
Hello there! :)

I personally didn't know the answer to this question, but I looked it up out of curiosity: 
"By the early 19th century, a nationalist movement developed and led to the reunification of Italy--except for Rome--in the 1860s. In 1861, Victor Emmanuel II of the House of Savoy was proclaimed King of Italy. Rome was incorporated in 1870."

I hope this helps :). 

Answer:

1866.

Explanation:

The growing dispute between Prussia and Austria over the German Problem transformed into a full-blown war in 1866, giving Italy an opportunity to apprehend Venetia. On April 8th, 1866, the Italian state approved a militant alliance with Prussia, through the intervention of Napoleon III, the Emperor of France.

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