"With respect to our State and federal governments, I do not think their relations correctly understood by foreigners. They generally suppose the former subordinate to the latter. But this is not the case. They are co-ordinate departments of one simple and integral whole."

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The constitution is either a superior paramount law, unchangeable by ordinary means, or it is on a level with ordinary legislative acts, alterable when the legislature shall please to alter it. It is emphatically the province and duty of the judicial department to say what the law is. This is the very essence of judicial duty.

— John Marshall