Money, resources, soldiers, allies
In the 1830's, the voice of a young nationalist leader began to be heard. Giuseppe Mazzini founded Young Italy. It was a secret society that called for the unification of Italy under a representative government. Mazzini opposed dictators and tyrants and came to symbolize the soul of Italian unification.
I'm sorry, did you answer your own question or do you still need clarification?
B. It returned to isolationism, avoiding any interaction with other nations beyond negotiating trade.
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Thay didn't. They just drew their maps differently. They never owned more land