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What if Italy instead of becoming a unified country, instead became a Federal Monarchy, similar to the USA under the Articles of Confederation or the German Empire years later, or just a confederation. Kingdoms, City-States and Republics can make foreign trades and have autonomy, but all pay lip-service to either the Piedmontese King (or the Italian Emperor, like how the German Empire did it) or/and the Pope?
Some of these states or provinces that could be part of this new confederation:
Kingdom of Sardinia(possibly head or Italian Emperor)
The Papal States (Possibly head/co-head)
Kingdom of the Two Sicilies
Either a restored Republic of Venice or Republic of San Marco
Grand Duchy of Tuscany
Duchy of Modena and Reggio
Republic of San Marino(Unlikely to join, but who knows)