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I've read in some old threads that if Garibaldi's expedition had failed, the Sicilians (of Sicily) would likely still have appealed to the Savoys for assistance as Sicily had long had a separatist movement from Naples.
So here's a thought: Let's say the expedition of the thousand fails and the Sicilians appeal to Napoleon III for assistance. The end result is the French acquiring Sicily. What now?
I can imagine a lot of Sicilians going to Algeria TTL.