"I consider the foundation of the Constitution as laid on this ground:
That 'all powers not delegated to the United States, by the Constitution,
nor prohibited by it to the States, are reserved to the States or to the
people' (10th Amendment). To take a single step beyond the boundaries
thus specifically drawn around the powers of Congress, is to take
possession of a boundless field of power, no longer susceptible to any
definition."
-- Thomas Jefferson
(1743-1826), US Founding Father,