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.
The Tenth Amendment, which makes explicit the idea that the federal government is limited only to the powers granted in the Constitution, has been declared to be truism by the Supreme Court. In United States v. Sprague (1931) the Supreme Court asserted that the amendment "added nothing to the [Constitution] as originally ratified."
States and local governments have occasionally attempted to assert exemption from various federal regulations, especially in the areas of labor and environmental controls, using the Tenth Amendment as a basis for their claim. An often-repeated quote, from United States v. Darby, 312 U.S. 100, 124 (1941), reads as follows:
The amendment states but a truism that all is retained which has not been surrendered. There is nothing in the history of its adoption to suggest that it was more than declaratory of the relationship between the national and state governments as it had been established by the Constitution before the amendment or that its purpose was other than to allay fears that the new national government might seek to exercise powers not granted, and that the states might not be able to exercise fully their reserved powers.
States and local governments have occasionally attempted to assert exemption from various federal regulations, especially in the areas of labor and environmental controls, using the Tenth Amendment as a basis for their claim. An often-repeated quote, from United States v. Darby, 312 U.S. 100, 124 (1941), reads as follows:
The amendment states but a truism that all is retained which has not been surrendered. There is nothing in the history of its adoption to suggest that it was more than declaratory of the relationship between the national and state governments as it had been established by the Constitution before the amendment or that its purpose was other than to allay fears that the new national government might seek to exercise powers not granted, and that the states might not be able to exercise fully their reserved powers.
