"[T]he vast regulatory structure the federal government has erected in the name of the commerce power cannot be ended overnight, in many cases, but the pretense that such programs are constitutional can be ended, even as the programs themselves are phased out over time."

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For the power given to Congress by the Constitution does not extend to the internal regulation of the commerce of a State (that is to say, of the commerce between citizen and citizen,) which remain exclusively with its own legislature; but to its external commerce only, that is to say, its commerce with another State, or with foreign nations, or with the Indian tribes.

— Thomas Jefferson