"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 [22 U.S. 1, 195]   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.

"But, in regulating commerce with foreign nations, the power of Congress does not stop at the jurisdictional lines of the several States. It would be a very useless power, if it could not pass those lines. The commerce of the United States with foreign nations, is that of the whole United States. Every district has a right to participate in it. The deep streams which penetrate our country in every direction, pass through the interior of almost every State in the Union, and furnish the means of exercising this right. If Congress has the power to regulate it, that power must be exercised whenever the subject exists. If it exists within the States, if a foreign voyage may commence or terminate at a port within a State, then the power of Congress may be exercised within a State.

"This principle is, if possible, still more clear, when [22 U.S. 1, 196]   applied to commerce 'among the several States.' They either join each other, in which case they are separated by a mathematical line, or they are remote from each other, in which case other States lie between them. What is commerce 'among' them; and how is it to be conducted? Can a trading expedition between two adjoining States, commence and terminate outside of each? And if the trading intercourse be between two States remote from each other, must it not commence in one, terminate in the other, and probably pass through a third? Commerce among the States must, of necessity, be commerce with the States. In the regulation of trade with the Indian tribes, the action of the law, especially when the constitution was made, was chiefly within a State. The power of Congress, then, whatever it may be, must be exercised within the territorial jurisdiction of the several States. The sense of the nation on this subject, is unequivocally manifested by the provisions made in the laws for transporting goods, by land, between Baltimore and Providence, between New- York and Philadelphia, and between Philadelphia and Baltimore.

"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. These are expressed in plain terms, and do not affect the [22 U.S. 1, 197]   questions which arise in this case, or which have been discussed at the bar. If, as has always been understood, the sovereignty of Congress, though limited to specified objects, is plenary as to those objects, the power over commerce with foreign nations, and among the several States, is vested in Congress as absolutely as it would be in a single government, having in its constitution the same restrictions on the exercise of the power as are found in the constitution of the United States. The wisdom and the discretion of Congress, their identity with the people, and the influence which their constituents possess at elections, are, in this, as in many other instances, as that, for example, of declaring war, the sole restraints on which they have relied, to secure them from its abuse. They are the restraints on which the people must often they solely, in all representative governments.

"The power of Congress, then, comprehends navigation, within the limits of every State in the Union; so far as that navigation may be, in any manner, connected with 'commerce with foreign nations, or among the several States, or with the Indian tribes.' It may, of consequence, pass the jurisdictional line of New-York, and act upon the very waters to which the prohibition now under consideration applies.

"But it 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 [22 U.S. 1, 198]   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 appellant, conceding these postulates, except the last, contends, that full power to regulate a particular subject, implies the whole power, and leaves no residuum; that a grant of the whole is incompatible with the existence of a right in another to any part of it.

Both parties have appealed to the constitution, to legislative acts, and judicial decisions; and have drawn arguments from all these sources, to support and illustrate the propositions they respectively maintain.

"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 State; 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. Although many of the powers formerly [22 U.S. 1, 199]   exercised by the States, are transferred to the government of the Union, yet the State governments remain, and constitute a most important part of our system. The power of taxation is indispensable to their existence, and is a power which, in its own nature, is capable of residing in, and being exercised by, different authorities at the same time. We are accustomed to see it placed, for different purposes, in different hands. Taxation is the simple operation of taking small portions from a perpetually accumulating mass, susceptible of almost infinite division; and a power in one to take what is necessary for certain purposes, is not, in its nature, incompatible with a power in another to take what is necessary for other purposes. Congress is authorized to lay and collect taxes, &c. to pay the debts, and provide for the common defence and general welfare of the United States. This does not interfere with the power of the States to tax for the support of their own governments; nor is the exercise of that power by the States, an exercise of any portion of the power that is granted to the United States. In imposing taxes for State purposes, they 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, [22 U.S. 1, 200]   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.

"In discussing the question, whether this power is still in the States, in the case under consideration, we may dismiss from it the inquiry, whether it is surrendered by the mere grant to Congress, or is retained until Congress shall exercise the power. We may dismiss that inquiry, because it has been exercised, and the regulations which Congress deemed it proper to make, are now in full operation. The sole question is, can a State regulate commerce with foreign nations and among the States, while Congress is regulating it?

"The counsel for the respondent answer this question in the affirmative, and rely very much on the restrictions in the 10th section, as supporting their opinion. They say, very truly, that limitations of a power, furnish a strong argument in favour of the existence of that power, and that the section which prohibits the States from laying duties on imports or exports, proves that this power might have been exercised, had it not been expressly forbidden; and, consequently, that any other commercial regulation, not expressly forbidden, to which the original power of the State was competent, may still be made."

[Gibbons v. Ogden, 22 U.S. 1 (1824)]

Lane County v. Oregon, 74 U.S. (7 Wall.) 71 (1868)

Both the states and the United States existed before the Constitution. The people, through that instrument, established a more perfect union by substituting a national government, acting, with ample power, directly upon the citizens, instead of the confederate government, which acted with powers, greatly restricted, only upon the states. But in many articles of the Constitution the necessary existence of the states, and, within their proper spheres, the independent authority of the states, is distinctly recognized. To them nearly the whole charge of interior regulation is committed or left; to them and to the people all powers not expressly delegated to the national government are reserved. The general condition was well stated by Mr. Madison in the Federalist thus:

The federal and state governments are in fact but different agents and trustees of the people, constituted with different powers and designated for different purposes.

Now, to the existence of the states, themselves necessary to the existence of the United States, the power of taxation is indispensable. It is an essential function of government. It was exercised by the Colonies, and when the Colonies became state, both before and after the formation of the Confederation, it was exercised by the new governments. Under the Articles of Confederation, the government of the United States was limited in the exercise of this power to requisitions upon the states, while the whole power of direct and indirect taxation of persons and property, whether by taxes on polls, or duties on imports, or duties on internal production, manufacture, or use, was acknowledged to belong exclusively [74 U.S. 77] to the states, without any other limitation than that of noninterference with certain treaties made by Congress. The Constitution, it is true, greatly changed this condition of things. It gave the power to tax, both directly and indirectly, to the national government, and, subject to the one prohibition of any tax upon exports and to the conditions of uniformity in respect to indirect and of proportion in respect to direct taxes, the power was given without any express reservation. On the other hand, no power to tax exports, or imports except for a single purpose and to an insignificant extent, or to lay any duty on tonnage was permitted to the states. In respect, however, to property, business, and persons within their respective limits, their power of taxation remained and remains entire. It is indeed a concurrent power, and in the case of a tax on the same subject by both governments, the claim of the United States, as the supreme authority, must be preferred, but with this qualification it is absolute. The extent to which it shall be exercised, the subjects upon which it shall be exercised, and the mode in which it shall be exercised are all equally within the discretion of the legislatures to which the states commit the exercise of the power. That discretion is restrained only by the will of the people expressed in the state constitutions or through elections, and by the condition that it must not be so used as to burden or embarrass the operations of the national government. There is nothing in the Constitution which contemplates or authorizes any direct abridgment of this power by national legislation. To the extent just indicated, it is an complete in the states as the like power, within the limits of the Constitution, is complete in Congress. If, therefore, the condition of any state, in the judgment of its legislature, requires the collection of taxes in kind -- that is to say by the delivery to the proper officers of a certain proportion of products, or in gold and silver bullion, or in gold and silver coin -- it is not easy to see upon what principle the national legislature can interfere with the exercise, to that end, of this power, original in the states and never as yet surrendered. If this be so, it is certainly [74 U.S. 78] a reasonable conclusion that Congress did not intend, by the general terms of the currency acts, to restrain the exercise of this power in the manner shown by the statutes of Oregon.

[Lane County v. Oregon, 74 U.S. (7 Wall.) 71 (1868)]