South Korea has tested 140k people for the coronavirus. The US: 1,500 people.

What you are missing is the underlying point, the us has massively failed to organize and execute a good testing program. The country that spends by far more than other countries per capita on medical care (already well know as a big waster of money because of lesser outcomes), that has an advanced and extensive public health network, it failed to create and provide testing kits for the virus, and with much less resources South Korea (and Taiwan and Italy and almost every other country that tried) did more than 100 times more testing.