Just some food for thought, population doesn't necessarily mean numbers in terms of mobsters. Sure it's usually the case like in new York, but then you got places like Scranton-pittston with a decent amount of Italians but by no means tons of them, and they had a powerful family. Meanwhile you got places like Argentina or Sao Paulo in Brazil which has millions of Italians that started coming at the end of the 1800's, but no real Italian mob families, except maybe a little, more recent ndrangheta activity. It's more about their surroundings and what part of Italy they are from. Most Italian Argentines were from the north, so that could explain it. Places like Pittston, Tampa, new Orleans, st Louis, ect have smaller Italian populations, but they were mostly Sicilian, hence why there were families. I'm not saying all sicilians are mobsters, but they are more often in the mob than northerners.