This phenomenon isn’t confined to Italy. You see it across Europe, the US, and (reversed) in Australia. Charitably, you could chalk it up to sunnier regions being better for agriculture and not cities, but I think that heat simply causes the human brain to thermally throttle, which makes humans in hotter climates slower (and dumber). And less enterprising, and wealthy. And certainly humans need to be more resourceful to survive in areas with less food available.

So you're saying it's a bad thing that the US has spent most of my lifetime squandering its social capital?