The Federalist Papers · Federalist No. 33 · paragraph 8

But it is said that the laws of the Union are to be the SUPREME LAW of the land. But what inference can be drawn from this, or what would they amount to, if they were not to be supreme? It is evident they would amount to nothing. A LAW, by the very meaning of the term, includes supremacy. It is a rule which those to whom it is prescribed are bound to observe. This results from every political association. If individuals enter into a state of society, the laws of that society must be the supreme regulator of their conduct. If a number of political societies enter into a larger political society, the laws which the latter may enact, pursuant to the powers intrusted to it by its constitution, must necessarily be supreme over those societies, and the individuals of whom they are composed. It would otherwise be a mere treaty, dependent on the good faith of the parties, and not a government,…

Publius · Alexander Hamilton, John Jay, James Madison · 1787–1788
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