If you aren't familiar with parts of western USA then you might not understand that a quarantine was never imposed in some areas because it was pointless. When there aren't very many people there isn't much need for a quarantine. I've driven parts of southeast Oregon where you can drive for an hour and never see another car. If you live in NYC you might not comprehend that there are thousands of acres of land with no people at all. If there aren't any visitors then there isn't any virus and no need for a quarantine.