"...nor prohibited by it...." Prohibited by the Constitution or prohibited by the United States? Not eminently clear. I know the intent so I know what it means...but to the average kardashian voter...probably not so much
I’m not sure how you could imagine that the ‘it’ refers to anything but the Constitution in a line of text referring exclusively to the Federal Constitution.
“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.”
You would have to be quite a stranger to the English language to think there is any subject here but the Federal Constitution which is both the context and the forum. But i suppose if you want read something backwards there is a simple reminity to that problem, Go back into history and read interpenetration and usesage of the founders.