China locked down the entire country and implemented draconian never that we have (and will not). Check out what is required to travel right now in China:

https://twitter.com/CarolYujiaYin/status/1239583581325778944

Here in the USA we are only two days removed from having run Democratic primaries where millions of people lined up and crowded together in small rooms - the total opposite of what China (and South Korea and Japan) have done. Images of packed beaches and boardwalks continue to emerge. The unfortunate fact is that many Americans aren't taking this pandemic seriously which is going to result in a much worse time of it than it could have otherwise been.