Page:Joseph Story, Commentaries on the Constitution of the United States (1st ed, 1833, vol II).djvu/539

 CH. XV.] industry and counteract such favoritism. It will then become a question, not of power, but of policy. Such a state of things has never yet existed. In fact the concession, that the power to regulate commerce may embrace other objects, than revenue, or even than commerce itself, is irreconcilable with the foundation of the argument on the other side.

§ 1084. Besides; the power is to regulate commerce. And in what manner regulate it? Why does the power involve the right to lay duties? Simply, because it is a common means of executing the power. If so, why does not the same right exist as to all other means equally common and appropriate? Why does the power involve a right, not only to lay duties, but to lay duties for revenue, and not merely for the regulation and restriction of commerce, considered per se? No other answer can be given, but that revenue is an incident to such an exercise of the power. It flows from, and does not create the power. It may constitute the motive for the exercise of the power, just as any other cause may; as for instance, the prohibition of foreign trade, or the retaliation of foreign monopoly; but it does not constitute the power.

§ 1085. Now, the motive of the grant of the power is not even alluded to in the constitution. It is not even stated, that congress shall have power to promote and encourage domestic navigation and trade. A power to regulate commerce is not necessarily a power to advance its interests. It may in given cases suspend its operations and restrict its advancement and scope. Yet no man ever yet doubted the right of congress to lay duties to promote and encourage domestic navigation, whether in the form of tonnage duties, or other preferences and privileges, either in the foreign trade, or