There's no such thing as US parmesan. Parmesan has PDO/DOP status and can only be made by wizened old men who've never travelled further than 12 miles from their picturesque place of birth in italy.
You can make "parmesan style hard cheese" but it's not the same. Grana padano is not parmesan, and that's PDO/DOP too
You can make "parmesan style hard cheese" but it's not the same. Grana padano is not parmesan, and that's PDO/DOP too