It is a power complete in itself, Exercisable at its utmost extent, and without limitations other than are prescribed by the Constitution....
"John Marshall and the Constitution A Chronicle of the Supreme Court, Volume 16 In The Chronicles Of America Series"
Edward S. Corwin
These two sets of officers, each independent of the other, constitute thus a whole of government, for each State separately; the powers ascribed to the one, as specifically made federal, exercised over the whole, the residuary powers, retained to the other, Exercisable exclusively over its particular State, foreign herein, each to the others, as they were before the original compact.
"Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson"
Thomas Jefferson
They claim, for example, and have commenced the exercise of a right to construct roads, open canals, and effect other internal improvements within the territories and jurisdictions exclusively belonging to the several States, which this Assembly does declare has not been given to that branch by the constitutional compact, but remains to each State among its domestic and unalienated powers, Exercisable within itself and by its domestic authorities alone.
"Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson"
Thomas Jefferson