Treaty of Paris
For i have never heard of the Treaty of France before
Well if you read about Anne Frank or read her diary, you notice she is very upbeat and seems to look at even unfortunate things in a bright way. She was rather young at the time so situations such as the one she was in probably didn't register as bad or unfortunate as it would in an adult's mind.
In 1866 Austria gave Venetia to France, and France gave it to Italy, so Venetia was again united with the rest of Italy. So, in 1866 Italian unification was advanced by annexing Venetia, an important and rich region.
By this time Lombardy, which long formed a unity with Venetia, was already united with Italy.