I've been trying to think of the best way to measure this. On the one hand we have way more people than Italy. On the other we are a lot more spread out. It's gonna spread faster in our cities but should spread more slowly overall.
I've been curious about that as well. I was thinking maybe comparing Italy to California would be in the ballpark. Italy has roughly 50% more population and twice the population density. But a lot of California's population is on the coast. So if you ignored the east half of California or probably two-thirds (where relatively few people live) it would probably be fairly similar.
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