NY Times has an interesting graphical display of the spread of the outbreak in the US, based on this non-peer reviewed preprint. It is softpaywalled but works in Chrome Incognito for me without signup. Some quotes: We traced the hidden spread of the epidemic to explain why the United States failed to stop it.At every crucial moment, American officials were weeks or months behind the reality of the outbreak. Those delays likely cost tens of thousands of lives. In New York City, where officials had found only a single case by March 1, roughly 10,000 infections had spread undetected. New Yorkers and visitors continued to travel out of the city. More than 5,000 contagious travelers left in the first two weeks of March, estimates suggest “I’m encouraging New Yorkers to go on with your lives and get out on the town,” Mayor Bill de Blasio said on March 2. By the time President Trump blocked travel from Europe on March 13, the restrictions were essentially pointless.The outbreak had already been spreading widely in most states for weeks. As late as March 10, the average person moved around pretty much as normal, according to cellphone data from Cuebiq. More than 22,000 deaths in the New York City area could have been avoided if the country had started social distancing just one week earlier, Columbia University researchers estimate.