If you had to choose one turning point (a single event / closely related series of events) that set “Italy” on the path of unification and that shaped the form unification would take, what would that turning point be? Why have you selected it?

If you had to choose one turning point (a single event / closely related series of events) that set “Italy” on the path of unification and that shaped the form unification would take, what would that turning point be? Why have you selected it? What is its significance for the history of the Risorgimento?