If the States may tax one instrument, employed by the Government in the execution of its powers, they may tax any and every other instrument. They ma… - John Marshall

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If the States may tax one instrument, employed by the Government in the execution of its powers, they may tax any and every other instrument. They may tax the mail; they may tax the mint; they may tax patent rights; they may tax the papers of the custom house; they may tax judicial process; they may tax all the means employed by the Government to an excess which would defeat all the ends of Government. This was not intended by the American people. They did not design to make their Government dependent on the States. [...] If the controlling power of the States be established, if their supremacy as to taxation be acknowledged, what is to restrain their exercising control in any shape they may please to give it? Their sovereignty is not confined to taxation; that is not the only mode in which it might be displayed. The question is, in truth, a question of supremacy, and if the right of the States to tax the means employed by the General Government be conceded, the declaration that the Constitution and the laws made in pursuance thereof shall be the supreme law of the land is empty and unmeaning declamation.