Garibaldi captured

WI the Bourbon navy had intercepted the Expedition of the Thousand before it reached Sicily?

Would they attempted to capture the two ships or sink them?

At any rate, I've certainly had this thought as well.

Certainly Italy does not unify so quickly.

Without the Kingdom of Italy on the southern flank of the Austrian Empire Bismarck may be less willing to risk war with Austria.

Delayed/Cancelled Germany maybe?
 
Actually, Italy was on its way to being unified anyway under Cavour's scheme of a slow unification. Garibaldis surprising takeover of the Two Sicilies actually threw Cavours plan into the air, and forced him to take the south much sooner then he would have liked to. Assuming Cavour knows what he is doing with his previous plan (Likely, he was quite an astute politician) you might possibly see a more successful Italy in the future.
 
Cavour wasn't interested in Italian unification, he was interested in furthering the goals of the Savoyards, and increasing his own fame and influence while he was at it. Much like Bismarck and Prussia, though not as lucky.

In regards to the OP Italy is divided between Savoyard north and Bourbon south. Now, with that being said, total Italian unification is unlikely to be completely stopped at such a late point. While Garibaldi becomes a martyr to the Italian unification, and republican, movements, he wasn't the only leader of those causes. Remember that the Expedition wouldn't have been so successful if the Neapolitans hadn't risen up against the Bourbon garrisons.
 
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