Having lived in all three countries, I would agree on the social interactions in general (although people socialise on mass in the big cities in the States, too), but travel around the States is also far more prevalent, with plane journeys being like bus journeys in Europe. It might have helped if Trump wasn't calling it a hoax made up by the Democrats and media for a week when it started appearing in the States. The reason Italy has been so catastrophically f***ed, is that the virus was transmitting freely in people for weeks before they knew they had such a terrible issue. This was also case in the U.S. And the testing required to keep a virus like this under control has been woefully under-carried. In fact its been utterly farcical and inept.
World history means little here. Containing a virus outbreak is down to the leaders at the time and the population. China have been obliterated in war several times from forces thought to be inferior to theirs, yet they have contained this virus (and others like SARS) due to the strength of their leaders and the servitude of their population. The population of the States don't suffer that sort of servitude, and unfortunately, have an absolute f***wit in charge at the absolute worst possible time. Hopefully the people below him make the right moves. State senators and mayors certainly seem to be, thankfully. I fear it won't be anywhere near enough. And if it isn't, millions could die.