Before revision: Our compartment model shows that the COVID-19 case mortality rate  decreased by at least 80 percent in most of the US states and at least 90 percent in most European countries. These drops are much larger and faster than those previously reported and surprisingly do not correlate well with our model parameters (such as the contact rateor testing rate) or state/national metrics such as the population density, GDP, and median age.
After revision: Our compartment model shows that the COVID-19 case mortality rate decreased by at least 80 percent in most of the US states and at least 90 \% in most of Europe. These are much larger and faster than those previously reported and surprisingly do not correlate well with our model parameters (such as the contact rateor testing rate) or state/national metrics such as the population density, GDP, and median age.