I would add the word "expressly" to the 10th amendment, modelled on article II of the Articles of Confederation, "Each state retains its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this Confederation expressly delegated to the United States, in Congress assembled."
Thus: "The powers not expressly 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."