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In the 'states' table, there were missing data and duplicate entries.
Cities were correctly associated with Italian regions, but provinces were not linked to anything. Additionally, not all 107 Italian provinces were included; notable ones such as Milan, Rome, Arezzo, etc., were absent.
List of province: https://en.wikipedia.org/wiki/Provinces_of_Italy
To eliminate duplicate data (provinces and regions) and ensure completeness (provinces), I have retained only the 20 Italian regions as the primary division among states-countries-cities.
List of regions: https://en.wikipedia.org/wiki/Regions_of_Italy