AHC: Prevent Italy from uniting

I think that some sort of Northern Italian unification is quite likely at some point.
Naples, however, could have easily stayed independent with pre-1848 PODs, and reduced Papal States may have remained as a buffer. There's also some chance at a separate Tuscany, albeit it's trickier.
By the way, Sicily had some chances to break away from Naples anyway.
Plenty of ways it can be done, although there will be a lot of public pressure to unification for a few decades (think of Germany/Austria for a OTL very rough parallel).
 
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