This regulation is strictly enforced in Italy. U.S. citizens may enter Italy for up to 90 days for tourist or business purposes without a visa.
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You're only allowed to visit Italy for a duration that does not exceed 90 days (3 months) in 180 days. In addition, you must not overstay and must return to the USA after your trip.
In general, Italians respect Americans and always welcome them as friends. They adore the curiosity of American tourists in regard to experiencing Italian culture, and they love the way that Americans enjoy their food.