I mean, the US is (a) a developed country with modern health-care, (b) there is no common 'old parents living in same home with some of the adult children' situation you have in Italy + Eastern Europe, (c) there are no norms of common physical contact like 'kissing on meeting' (see France, Italy, northern Romania etc.), (d) the population is generally very dispersed (compare US density with areas of Western Europe or China) and (e) there is prevalent use of personal cars instead of public transport (as opposed to Western Europe and China, again), which should further diminish transmission.
US stats look worrying for everyone on Earth, it almost looks like a wild difference in viral strains or some other important but unknown factor.