“The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.”
As usual, I find Kurt Lash persuasive – in this case, his recent guest post (responding to John Mikhail) on the Tenth Amendment. But I think Professor Mikhail may still be right that Hammer v. Dagenhart was wrongly decided. Hammer was the pre-New Deal commerce clause...