France has found a person who tested positive to Covid -19 back in December, before China even reported the Wuhan outbreak to the WHO, so it is very possible there have been numerous undiagnosed cases around the world that were assumed to be influenza and never diagnosed as Covid-19. 
The USA had the virus circulating widely well before Trump belatedly stopped flights. The New York virus came from Europe, particularly Milan, and spread around most of the USA, while the Washington strain came from China and is less widespread in the USA.
Remember, coronaviruses are not new - they are numerous and widespread. We have Hendra and Lyssavirus, but our bats don't have SARS 2, which is what causes Covid-19. I have been vaccinated against Lyssavirus, incidentally.
We have to get over this politically-ibspired obsession with blaming China for SARS 2, when they were merely the first to diagnose it, because China has high medical standards. We must recognise that the world has always been awash in deadly viruses, but most don't usually jump to humans (we hope 

).
Now that SARS 2 is infecting humans it will inevitably become endemic, so we will all get it eventually, and if they find a vaccine that will merely limit its severity and spread. So, that's something to look forward too. 

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