Summary

Portrait of Joseph Story Joseph Story Watson v. Mercer — Opinion of the Court

It is not sufficient to allege, that the constitution has been violated. Courts will not declare laws unconstitutional for light or trivial causes. 'This power,' says chief justice Tilghman, 3 Serg. and R. 73, 'is a power of high responsibility, and not to be exercised but in cases free from doubt.'
But the inquiry is important in another sense; because, if the act of the legislature of Pennsylvania divests rights which are vested by law in an individual, if it does not violate a contract, it has nothing to do with the constitution of the United States.
Source: Wikisource

Portrait of Joseph Story Joseph Story Watson v. Mercer — Opinion of the Court

The argument for the plaintiffs in error is, first, that the act violates the constitution of the United States, because it devests their vested rights as heirs at law of the premises in question: and secondly, that it violates the obligation of a contract, that is, of the patent granted by the proprietaries of Pennsylvania to Samuel Patterson, the ancestor of the original defendants, from whom they trace their title to the premises, by descent through Margaret Mercer.
Source: Wikisource

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