If I buy an unlocked iPhone in Europe, can it be used in the US?

I had my brand new iPhone 12 snatched from my hands on a train in the south of Italy. I will be studying here for two more months and not having a phone is becoming a safety concern. I have insurance and got a new one delivered to my home in the US, but overseas shipping, customs costs, and a long waiting period are not worth just buying a new phone here. If I were to buy a new iPhone 12 in Italy for about 850 euros, at the end of the two months, would I be able to take it back to the US and sell it if I do not get service on it? If I got a European SIM card, could I get data service (say from Vodafone) for the remainder of my time here and still sell it unlocked in the US? Any advice is greatly appreciated!!