Your analysis misses the point that in developed nations like the US and Europe, sanitation, public health measures, and medical research, prevention, and care are far more substantial and effective than in China and most of Asia. Moreover, the form of government makes a difference, with ethnically Chinese but free Taiwan and Singapore doing a far better job of dealing with the virus than mainland China. When COVID-19 reaches the US in force, it is likely to have only a relatively small impact on American public health.
If our government was as competent as Singapore's, I wouldn't worry. Look at Italy as modern, western, democracy to see how it might spread here. Note that it is hitting Lombardy, the wealthy, more western European north part of Italy, not the south. 9 days ago, there were 3 confirmed cases in Italy, now there are 1,128. If things accelerate at that rate in the US, we are in big trouble.