You can't compare Italy to the US. Italians use public transport MUCH more than we do, as does much of Europe. Using rail and bus to get around town is essentially non-existent here for the majority of Americans.
For that, you'd need a similarly cold weather place with packed subways, like New York or Massachusetts. And let's go look at the map where we have larger numbers per capita.... NY and MA! Seems to fit. D.C. is primed for it too.
The rest of the country cannot compare. For California to be on par, we should have double the east coast cases by now, even more with our demographics and airport hubs to Asia, but we are at less than half. Most of them in Silicon Valley, as could be predicted with so much travel to China/Korea going on there.
My prediction: CA will get more cases, but there will be no 'crisis' here like Italy. Not even close to it.