alternatehistory.com

With a POD no earlier than the Congress of Vienna set it up so that there's no central nation of Italy in the present day.

You can have the peninsula be ruled by any combination of foreign powers (France, Austria, whomever) and/or Italian-based city-states/kingdoms (Venice, Naples, Papal States, Piedmont, whomever) as long as the peninsula itself is Balkanized and there are multiple entities with some semblance of power.
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