COVID-19 Outbreak (Update: More than 2.9M cases and 132,313 deaths in US)
From what I read, the states do have the power to do these types of things if their state constitutions do not prohibit it. The federal government does not have the power to do stay at home orders because the federal constitution only gives the federal government powers it actually states. That being said, the federal courts have long thrown that out the window and will generally rule that the federal government can do whatever it wants even though it is clear from reading the constitution and the volumes written from the ratifying conventions that this was never the intent of the framers or ratifiers.