If it can be shown, by anything in the Constitution itself, that when it confers on Congress the power to make all needful rules and regulations respecting the territory belonging to the United States, the exclusion or the allowance of slavery was excepted; or if anything in the history of this provision tends to show that such an exception was intended by those who framed and adopted the Constitution to be introduced into it, I hold it to be my duty carefully to consider, and to allow just weight to such considerations in interpreting the positive text of the Constitution. But where the Constitution has said all needful rules and regulations, I must find something more than theoretical reasoning to induce me to say it did not mean all.
There have been eminent instances in this court closely analogous to this one, in which such an attempt to introduce an exception, not found in the Constitution itself, has failed of success.
By the eighth section of the first article, Congress has the power of exclusive legislation in all cases whatsoever within this District.
In the case of Loughborough v. Blake, (5 Whea., 324,) the question arose, whether Congress has power to impose direct taxes on persons and property in this District. It was insisted, that though the grant of power was in its terms broad enough to include direct taxation, it must be limited by the principle, that taxation and representation are inseparable. It would not be easy to fix on any political truth, better established or more fully admitted in our country, than that taxation and representation must exist together. We went into the war of the Revolution to assert it, and it is incorporated as fundamental into all American Governments. But however true and important this maxim may be, it is not necessarily of universal application. It was for the people of the United States, who ordained the Constitution, to decide whether it should or should not be permitted to operate within this District. Their decision was embodied in the words of the Constitution; and as that contained no such exception as would permit the maxim to operate in this District, this court, interpreting that language, held that the exception did not exist.
Again, the Constitution confers on Congress power to regulate commerce with foreign nations. Under this, Congress passed an act on the 22d of December, 1807, unlimited in duration, laying an embargo on all ships and vessels in the ports or within the limits and jurisdiction of the United States. No law of the United States ever pressed so severely upon particular States. Though the constitutionality of the law was contested with an earnestness and zeal proportioned to the ruinous effects which were felt from it, and though, as Mr. Chief Justice Marshall has said, (9 Wheat., 192,) "a want of acuteness in discovering objections to a measure to which they felt the most deep-rooted hostility will not be imputed to those who were arrayed in opposition to this," I am not aware that the fact that it prohibited the use of a particular species of property, belonging almost exclusively to citizens of a few States, and this indefinitely, was ever supposed to show that it was unconstitutional. Something much more stringent, as a ground of legal judgment, was relied on—that the power to regulate commerce did not include the power to annihilate commerce.
But the decision was, that under the power to regulate commerce, the power of Congress over the subject was restricted only by those exceptions and limitations contained in the Constitution; and as neither the clause in question, which was a general grant of power to regulate commerce, nor any other clause of the Constitution, imposed any restrictions as to the duration of an embargo, an unlimited prohibition of the use of the shipping of the country was within the power of Congress. On this subject, Mr. Justice Daniel, speaking for the court in the case of United States v. Marigold, (9 How., 560,) says: "Congress are, by the Constitution, vested with the power to regulate commerce with foreign nations; and however, at periods of high excitement, an application of the terms 'to regulate commerce,' such as would embrace absolute prohibition, may have been questioned, yet, since the passage of the embargo and non-intercourse laws, and the repeated judicial sanctions these statutes have received, it can scarcely at this day be open to doubt, that every subject falling legitimately within the sphere of commercial regulation may be partially or wholly excluded, when either measure shall be demanded by the safety or the important interests of the entire nation. The power once conceded, it may operate on any and every subject of commerce to which the legislative discretion may apply it."
If power to regulate commerce extends to an indefinite prohibition of the use of all vessels belonging to citizens of the several States, and may operate, without exception, upon every subject of commerce to which the legislative discretion may apply it, upon what grounds can I say that power to make all needful rules and regulations respecting the territory of the United States is subject to an exception of the allowance or prohibition of slavery therein?
While the regulation is one "respecting the territory," while it is, in the judgment of Congress, "a needful regulation," and is thus completely within the words of the grant, while no other clause of the Constitution can be shown, which requires the insertion of an exception respecting slavery, and while the practical construction for a period of upwards of fifty years forbids such an exception, it would, in my opinion, violate every sound rule of interpretation to force that exception into the Constitution upon the strength of abstract political reasoning, which we are bound to believe the people of the United States thought insufficient to induce them to limit the power of Congress, because what they have said contains no such limitation.
Before I proceed further to notice some other grounds of supposed objection to this power of Congress, I desire to say, that if it were not for my anxiety to insist upon what I deem a correct exposition of the Constitution, if I looked only to the purposes of the argument, the source of the power of Congress asserted in the opinion of the majority of the court would answer those purposes equally well. For they admit that Congress has power to organize and govern the Territories until they arrive at a suitable condition for admission to the Union; they admit, also, that the kind of Government which shall thus exist should be regulated by the condition and wants of each Territory, and that it is necessarily committed to the discretion of Congress to enact such laws for that purpose as that discretion may dictate; and no limit to that discretion has been shown, or even suggested, save those positive prohibitions to legislate, which are found in the Constitution.
I confess myself unable to perceive any difference whatever between my own opinion of the general extent of the power of Congress and the opinion of the majority of the court, save that I consider it derivable from the express language of the Constitution, while they hold it to be silently implied from the power to acquire territory. Looking at the power of Congress over the Territories as of the extent just described, what positive prohibition exists in the Constitution, which restrained Congress from enacting a law in 1820 to prohibit slavery north of thirty-six degrees thirty minutes north latitude?