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Whatever power may be necessary for the National Government a certain portion must necessarily be left in the States. It is impossible for one power to pervade the extreme parts of the U.S. so as to carry equal justice to them.

"The Journal of the Debates in the Convention which Framed the Constitution of the United States, May-September, 1787", Volume 2, as recorded by James Madison, 1908.
Whatever power may be necessary for the National Government a certain portion must necessarily be left in the States. It is impossible for one power to pervade the extreme parts of the U.S. so as to carry equal justice