Question

how do italy unified

Answer 1

Italian unification, or the Risorgimento, was the political and social movement that consolidated different states of the Italian peninsula into the single state of the Kingdom of Italy in the 19th century

Answer 2

Italian unification (called in Italian the Risorgimento, or "Resurgence") was the political and social process that unified disparate countries of the Italian peninsula into the single nation of Italy between the 19th century and the beginning of the 20th century.

It is difficult to pin down exact dates for the beginning and end of Italian reunification, but most scholars agree that it began with the Congress of Vienna in 1815 and the end of Napoleon's rule, and largely ended with the Franco-Prussian War in 1871, though the last irredented cities did not join the Kingdom of Italy until the Treaty of Saint-Germain after World War