I don't know about the American one, but as for the Italian one,
I think that, even though they are still strong in Sicily, they are being gradually substituted by other organizations, especially the 'ndrangheta, on the international level. At least, that's what I understood from what I watched on TV and read about the Cosa Nostra. I don't know if the information is correct though. Even the experts can't be 100% sure since the mafia is secretive and has kept rather quiet since the arrest of Totò Riina and his goons. At least, no more terroristic attacks.
what happened is that sicilian mafia was damaged by the police by far more than ndrangheta and camorra in the latest 20 years
and it's as strong as them today, it's not anymmore a superpower like it was in the 80s under totò riina
ndrangheta and camorra even at their peaks are not even close to cosa nostra at its peak, no comparison at all, people do comparison between cosa nostra in the '80 and today, that's coz said all that stuff
anyway probably in europe as a whole ndrangheta and camorra are stronger today but in the americas cosa nostra is still the strongest by far
