Is the South side of Detroit like the South side of Chicago ? Maybe the people there are more hardy.
I watch a doctor on Laura and he says that MOST of the CV19 patients are overweight, have diabetes or pre diabetes almost 100% of them are the ones that end up in trouble!!!
After reviewing the U of Washington models, it looks like Minn. is just going slower in getting the virus rolled out throughout the State:
https://covid19.healthdata.org/projections
Open two instances and then select Mich. in one and Minn. in the other.