To add a bit of my own conjecture onto the pile, I'd also say the increased rates among the minority populations in NY may be correlated to their lower socioeconomic position, which in turn has lead to denser housing for them.Wild ass guess? Population density. Even though these people were not working and not traveling, they were still going out grocery shopping and to get food/supplies a couple times a week. Exposed to others in the elevator and stairwells, walking to/from the store, and the store itself.
It's a lot easier to stay isolated in suburbia and have adequate space to 'stock up' on food and supplies.
California is finally starting to enter "phase 1" though the general lock down in the Bay Area is extending up until the end of May. All of which makes me wonder about this fall. I'm finally shooting to wrap up my degree at UC Davis, only for all this to happen. Be interesting to see if the campus is even going to be open come September.