Leif Erikson wrote:
> Article I, Section 8 lays out the powers vested in the Congress:
>
> Clause 1: The Congress shall have Power To lay and collect Taxes,
> Duties, Imposts and Excises, to pay the Debts and provide for the
> common Defence and general Welfare of the United States; but all
> Duties, Imposts and Excises shall be uniform throughout the United
> States;

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> The only clause that appears as if it might authorize national parks is
> #17,

I'd say it could be considered part of providing for the
general welfare. I'd certainly consider having areas of
wilderness available to the public a benefit to general
welfare of the population.

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