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MR. CHIEF JUSTICE MARSHALL delivered the opinion of the Court: . . .
The words [of the Constitution] are, "congress shall have power to regulate commerce with foreign
nations, and among the several states, and with the Indian tribes." The subject to be regulated is
"commerce;" and our constitution being, as was aptly said at the bar, one of enumeration, and
not of definition, to ascertain the extent of the power, it becomes necessary to settle the meaning of
the word. The counsel for the appellee [Ogden] would limit it to traffic, to buying and selling, or the
interchange of commodities, and do not admit that it comprehends navigation. This would restrict a general
term, applicable to many objects, to one of its significations. Commerce, undoubtedly, is traffic, but
it is something more—it is intercourse. It describes the commercial intercourse between nations, and parts
of nations, in all its branches, and is regulated by prescribing rules for carrying on that intercourse.
The mind can scarcely conceive a system for regulating commerce between nations, which shall exclude all
laws concerning navigation, which shall be silent on the admission of the vessels of the one nation into
the ports of the other, and be confined to prescribing rules for the conduct of individuals, in the actual
employment of buying and selling, or of barter. If commerce does not include navigation, the government
of the Union has no direct power over that subject, and can make no law prescribing what shall constitute
American vessels, or requiring that they shall be navigated by American seamen. Yet this power has been
exercised from the commencement of the government, has been exercised with the consent of all, and has
been understood by all to be a commercial regulation. All America understands, and has uniformly understood,
the word "commerce," to comprehend navigation. It was so understood, and must have been so understood,
when the constitution was framed. The power over commerce, including navigation, was one of the primary
objects for which the people of America adopted their government, and must have been contemplated in forming
it. The convention must have used the word in that sense, because all have understood it in that sense;
and the attempt to restrict it comes too late. . . .
. . . The 9th section of the last article declares, that "no preference shall be given, by any regulation
of commerce or revenue, to the ports of one state over those of another." . . . . [T]he subsequent
part of the sentence is still more explicit. It is, "nor shall vessels bound to or from one state,
be obliged to enter, clear or pay duties in another." These words have a direct reference to navigation.
. . .
. . . To what commerce does this power extend? The constitution informs us, to commerce "with foreign
nations, and among the several states, and with the Indian tribes." It has, we believe, been universally
admitted, that these words comprehend every species of commercial intercourse between the United States
and foreign nations. No sort of trade can be carried on between this country and any other, to which this
power does not extend. It has been truly said, that commerce, as the word is used in the constitution,
is a unit, every part of which is indicated by the term.
If this be the admitted meaning of the word, in its application to foreign nations, it must carry the
same meaning throughout the sentence, and remain a unit, unless there be some plain intelligible cause
which alters it. The subject to which power is next applied, is to commerce, "among the several states."
The word "among" means intermingled with. A thing which is among others, is intermingled with
them. Commerce among the states, cannot stop at the external boundary line of each state, but may be introduced
into the interior. It is not intended to say, that these words comprehend that commerce, which is completely
internal, which is carried on between man and man in a state, or between different parts of the same state,
and which does not extend to or affect other states. Such a power would be inconvenient, and is certainly
unnecessary. Comprehensive as the word "among" is, it may very properly be restricted to that
commerce which concerns more states than one. The phrase is not one which would probably have been selected
to indicate the completely interior traffic of a state, because it is not an apt phrase for that purpose;
and the enumeration of the particular classes of commerce to which the power was to be extended, would
not have been made, had the intention been to extend the power to every description. The enumeration presupposes
something not enumerated; and that something, if we regard the language or the subject of the sentence,
must be the exclusively internal commerce of a state. The genius and character of the whole government
seem to be, that its action is to be applied to all the external concerns of the nation, and to those
internal concerns which affect the states generally; but not to those which are completely within a particular
state, which do not affect other states, and with which it is not necessary to interfere, for the purpose
of executing some of the general powers of the government. The completely internal commerce of a state,
then, may be considered as reserved for the state itself. . . .
We are now arrived at the inquiry—what is this power? It is the power to regulate; that is, to prescribe
the rule by which commerce is to be governed. This power, like all others vested in congress, is complete
in itself, may be exercised to its utmost extent, and acknowledges no limitations, other than are prescribed
in the constitution. . . .
But as has been urged, with great earnestness, that although the power of congress to regulate commerce
with foreign nations, and among the several states, be co-extensive with the subject itself, and have
no other limits than are prescribed in the constitution, yet the states may severally exercise the same
power, within their respective jurisdictions. In support of this argument, it is said, that they possessed
it as an inseparable attribute of sovereignty, before the formation of the constitution, and still retain
it, except so far as they have surrendered it by that instrument; that this principle results from the
nature of the government, and is secured by the tenth amendment; that an affirmative grant of power is
not exclusive, unless in its own nature it be such that the continued exercise of it by the former possessor
is inconsistent with the grant and that this is not of that description. . . .
The grant of the power to lay and collect taxes is, like the power to regulate commerce, made in general
terms, and has never been understood to interfere with the exercise of the same power by the states; and
hence has been drawn an argument which has been applied to the question under consideration. But the two
grants are not, it is conceived, similar in their terms or their nature. . . . In imposing taxes for state
purposes, the states are not doing what congress is empowered to do. Congress is not empowered to tax
for those purposes which are within the exclusive province of the states. When, then, each government
exercises the power of taxation, neither is exercising the power of the other. But when a state proceeds
to regulate commerce with foreign nations, or among the several states, it is exercising the very power
that is granted to congress, and is doing the very thing which congress is authorized to do. There is
no analogy, then, between the power of taxation and the power of regulating commerce.
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