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 thinks that an obligation of this kind is impaired by a law passed in his state, he may refuse to obey it, and may appeal to the federal courts. This provision appears to me to be the most serious attack upon the independence of the states. The rights awarded to the federal government for purposes of obvious national importance are definite and easily comprehensible; but those with which this last clause invests it are not either clearly appreciable or accurately defined. For there are vast numbers of political laws which influence the obligations of contracts, which may thus furnish an easy pretext for the aggressions of the central authority.

[The fears of the author respecting the danger to the independence of the states of that provision of the constitution, which gives to the federal courts the authority of deciding when a state law impairs the obligation of a contract, are deemed quite unfounded. The citizens of every state have a deep interest in preserving the obligation of the contracts entered into by them in other states: indeed without such a controlling power, “commerce among the several states” could not exist. The existence of this common arbiter is of the last importance to the continuance of the Union itself, for