Earlier quoted context omitted.
Doesn't the US have out-of-hours pharmacies, or out of hours doctors, or urgent but not emergency treatment centres?
Not really. There are non-ER/non-hospital urgent-care centers, but they usually keep to roughly normal business hours. For after-hours care, the ER at a hospital is often your only option.
But many places don't have any kind of Urgent Care centers, much less one that is open 24 hours a day.