Now there are in the United States, the results of State or private enterprise, upward of 17,000 miles of railroads and 5,000 miles of canals; in all, 22,000 miles, the total cost of which may be estimated at little short of $600,000,000; and if the same works had been constructed by the Federal Government, supposing the thing to have been practicable, the cost would have probably been not less than $900,000,000. The number of persons employed in superintending, managing, and keeping up these canals and railroads may be stated at 126,000 or thereabouts, to which are to be added 70,000 or 80,000 employed on the railroads in construction, making a total of at least 200,000 persons, representing in families nearly 1,000,000 souls, employed on or maintained by this one class of public works in the United States.

In view of all this, it is not easy to estimate the disastrous consequences which must have resulted from such extended local improvements being undertaken by the General Government. State legislation upon this subject would have been suspended and private enterprise paralyzed, while applications for appropriations would have perverted the legislation of Congress, exhausted the National Treasury, and left the people burdened with a heavy public debt, beyond the capacity of generations to discharge.

Is it conceivable that the framers of the Constitution intended that authority drawing after it such immense consequences should be inferred by implication as the incident of enumerated powers? I can not think this, and the impossibility of supposing it would be still more glaring if similar calculations were carried out in regard to the numerous objects of material, moral, and political usefulness of which the idea of internal improvement admits. It may be safely inferred that if the framers of the Constitution had intended to confer the power to make appropriations for the objects indicated, it would have been enumerated among the grants expressly made to Congress.. When, therefore, any one of the powers actually enumerated is adduced or referred to as the ground of an assumption to warrant the incidental or implied power of "internal improvement," that hypothesis must be rejected, or at least can be no further admitted than as the particular act of internal improvement may happen to be necessary to the exercise of the granted power. Thus, when the object of a given road, the clearing of a particular channel, or the construction of a particular harbor of refuge is manifestly required by the exigencies of the naval or military service of the country, then it seems to me undeniable that it may be constitutionally comprehended in the powers to declare war, to provide and maintain a navy, and to raise and support armies. At the same time, it would be a misuse of these powers and a violation of the Constitution to undertake to build upon them a great system of internal improvements. And similar reasoning applies to the assumption of any such power as is involved in that to establish post-roads and to regulate commerce. If the particular improvement, whether by land or sea, be necessary to the execution of the enumerated powers, then, but not otherwise, it falls within the jurisdiction of Congress. To this extent only can the power be claimed as the incident of any express grant to the Federal Government.

But there is one clause of the Constitution in which it has been suggested that express authority to construct works of internal improvement has been conferred on Congress, namely, that which empowers it "to exercise exclusive legislation in all cases whatsoever over such district (not exceeding 10 miles square) as may by cession of particular States and the acceptance of Congress become the seat of the Government of the United States, and to exercise like authority over all places purchased by the consent of the legislature of the State in which the same shall be for the erection of forts, magazines, arsenals, dockyards, and other needful buildings..." But any such supposition will be seen to be groundless when this provision is carefully examined and compared with other parts of the Constitution.

It is undoubtedly true that "like authority" refers back to "exclusive legislation in all cases whatsoever" as applied to the District of Columbia, and there is in the District no division of powers as between the General and the State Governments.

In those places which the United States has purchased or retains within any of the States—sites for dockyards or forts, for example—legal process of the given State is still permitted to run for some purposes, and therefore the jurisdiction of the United States is not absolutely perfect. But let us assume for the argument's sake that the jurisdiction of the United States in a tract of land ceded to it for the purpose of a dockyard or fort by Virginia or Maryland is as complete as in that ceded by them for the seat of Government, and then proceed to analyze this clause of the Constitution.

It provides that Congress shall have certain legislative authority over all places purchased by the United States for certain purposes. It implies that Congress has otherwise the power to purchase. But where does Congress get the power to purchase? Manifestly it must be from some other clause of the Constitution, for it is not conferred by this one. Now, as it is a fundamental principle that the Constitution is one of limited powers, the authority to purchase must be conferred in one of the enumerations of legislative power; so that the power to purchase is itself not an unlimited one, but is limited by the objects in regard to which legislative authority is directly conferred.

The other expressions of the clause in question confirm this conclusion, since the jurisdiction is given as to places purchased for certain enumerated objects or purposes. Of these the first great division—forts, magazines, arsenals, and dockyards—is obviously referable to recognized heads of specific constitutional power. There remains only the phrase "and other needful buildings." Wherefore needful? Needful for any possible purpose within the whole range of the business of society and of Government? Clearly not; but only such "buildings" as are "needful" to the United States in the exercise of any of the powers conferred on Congress.

Thus the United States need, in the exercise of admitted powers, not only forts, magazines, arsenals, and dockyards, but also court-houses, prisons, custom-houses, and post-offices within the respective States. Places for the erection of such buildings the General Government may constitutionally purchase, and, having purchased them, the jurisdiction over them belongs to the United States. So if the General Government has the power to build a light-house or a beacon, it may purchase a place for that object; and having purchased it, then this clause of the Constitution gives jurisdiction over it. Still, the power to purchase for the purpose of erecting a light-house or beacon must depend on the existence of the power to erect, and if that power exists it must be sought after in some other clause of the Constitution.

From whatever point of view, therefore, the subject is regarded, whether as a question of express or implied power, the conclusion is the same, that Congress has no constitutional authority to carry on a system of internal improvements; and in this conviction the system has been steadily opposed by the soundest expositors of the functions of the Government.