they may assume the provision of the poor;
they may undertake the regulation of all roads other than post-roads;
in short, every thing, from the highest object of state legislation
down to the most minute object of police,
would be thrown under the power of Congress.... Were the power
of Congress to be established in the latitude contended for,
it would subvert the very foundations, and transmute the very nature
of the limited Government established by the people of America."