WI: Expedition of the Thousand fails

IOTL, the Expedition of The Thousand, spearheaded by Giuseppe Garibaldi, was a splendid success, despite the military superiority of the Two Sicilies' royalist armies. It could be said that Garibaldi's expedition was a risky gamble, and historians often compare it to Che and Castro's march through Cuba.
So, I ask: what if Garibaldi's expedition had failed (preferentially early on)?
What are the effects on the ongoing italian unification? Will the savoyards still attempt to attack Naples through the north? What happens to the Papal States?
With Italy broken in half, who will support whom? Will France continue supporting Sardinia-Piedmont?
In case the Austro-Prussian War still happens and Naples is allied to Austria, then could Sardinia-Piedmont end up allying with Prussia to attack the neapolitans?
 
I suppose I'll give a good idea.

Had the Expedition of the Thousand failed, Sardinia-Piedmont probably wouldn't try to go after Neapolitan lands and unite the peninsula. For one thing to take into consideration is that, the two largest militaries on the Italian Peninsula prior to the 1859 war, and perhaps even before, were Sardinia-Piedmont and the Two Sicilies. (Discounting the elephant that is Austria) Couple this with Neapolitan support on top of French protection of the Papal States, and Sardinia will probably only end up getting Lombardy and the Central Italian States (minus the Papal Littoral) during the post Second Independence War spiel.
 
I don't think that Sardinia piedmont would go after southern Italy if the exposition of the thousand failed. Initially the unification of Italy planned by Sardinia piedmont only included northern Italy, southern Italy was incorporated into the kingdom because girabaldi had succeeded and the sardinians/Piedmontese saw an golden opportunity to to expand the kingdom at no cost.
 
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