Had the greatest vocal range of any tenor! He once sang "Vecchia Zimarra", at the end of "La Boheme" when the bass had vocal difficuty. One of the first lip synchs in history.
The only criticism is that Caruso’s English heavily accented with his strong Italian accent which otherwise hampers this - though his wife Dorothy tried hard to help him to sing this in English. Otherwise, vocal wise technique and his Italian - solid.
Actually most of the people who came here from Europe through Ellis Island when you say a legal system there was no official immigration system in place not like the one we have today most of those people from Europe would have been considered illegal aliens under the rules that are in place today you can attack me if you like but this is the truth