Fourth. That as the plea to the jurisdiction in this case shows no facts, except that the plaintiff was of African descent, and his ancestors were sold as slaves, and as these facts are not inconsistent with his citizenship of the United States, and his residence in the State of Missouri, the plea to the jurisdiction was bad, and the judgment of the Circuit Court overruling it was correct.

I dissent, therefore, from that part of the opinion of the majority of the court, in which it is held that a person of African descent cannot be a citizen of the United States; and I regret I must go further, and dissent both from what I deem their assumption of authority to examine the constitutionality of the act of Congress commonly called the Missouri compromise act, and the grounds and conclusions announced in their opinion.

Having first decided that they were bound to consider the sufficiency of the plea to the jurisdiction of the Circuit Court, and having decided that this plea showed that the Circuit Court had not jurisdiction, and consequently that this is a case to which the judicial power of the United States does not extend, they have gone on to examine the merits of the case as they appeared on the trial before the court and jury, on the issues joined on the pleas in bar, and so have reached the question of the power of Congress to pass the act of 1820. On so grave a subject as this, I feel obliged to say that, in my opinion, such an exertion of judicial power transcends the limits of the authority of the court, as described by its repeated decisions, and, as I understand, acknowledged in this opinion of the majority of the court.

In the course of that opinion, it became necessary to comment on the case of Legrand v. Darnall, (reported in 2 Peters's R., 664.) In that case, a bill was filed, by one alleged to be a citizen of Maryland, against one alleged to be a citizen of Pennsylvania. The bill stated that the defendant was the son of a white man by one of his slaves; and that the defendant's father devised to him certain lands, the title to which was put in controversy by the bill. These facts were admitted in the answer, and upon these and other facts the court made its decree, founded on the principle that a devise of land by a master to a slave was by implication also a bequest of his freedom. The facts that the defendant was of African descent, and was born a slave, were not only before the court, but entered into the entire substance of its inquiries. The opinion of the majority of my brethren in this case disposes of the case of Legrand v. Darnall, by saying, among other things, that as the fact that the defendant was born a slave only came before this court on the bill and answer, it was then too late to raise the question of the personal disability of the party, and therefore that decision is altogether inapplicable in this case.

In this I concur. Since the decision of this court in Livingston v. Story, (11 Pet., 351,) the law has been settled, that when the declaration or bill contains the necessary averments of citizenship, this court cannot look at the record, to see whether those averments are true, except so far as they are put in issue by a plea to the jurisdiction. In that case, the defendant denied by his answer that Mr. Livingston was a citizen of New York, as he had alleged in the bill. Both parties went into proofs. The court refused to examine those proofs, with reference to the personal disability of the plaintiff. This is the settled law of the court, affirmed so lately as Shepherd v. Graves, (14 How., 27,) and Wickliff v. Owings, (17 How., 51.) (See also De Wolf v. Rabaud, 1 Pet., 476.) But I do not understand this to be a rule which the court may depart from at its pleasure. If it be a rule, it is as binding on the court as on the suitors. If it removes from the latter the power to take any objection to the personal disability of a party alleged by the record to be competent, which is not shown by a plea to the jurisdiction, it is because the court are forbidden by law to consider and decide on objections so taken. I do not consider it to be within the scope of the judicial power of the majority of the court to pass upon any question respecting the plaintiff's citizenship in Missouri, save that raised by the plea to the jurisdiction; and I do not hold any opinion of this court, or any court, binding, when expressed on a question not legitimately before it. (Carroll v. Carroll, 16 How., 275.) The judgment of this court is, that the case is to be dismissed for want of jurisdiction, because the plaintiff was not a citizen of Missouri, as he alleged in his declaration. Into that judgment, according to the settled course of this court, nothing appearing after a plea to the merits can enter. A great question of constitutional law, deeply affecting the peace and welfare of the country, is not, in my opinion, a fit subject to be thus reached.

But as, in my opinion, the Circuit Court had jurisdiction, I am obliged to consider the question whether its judgment on the merits of the case should stand or be reversed.

The residence of the plaintiff in the State of Illinois, and the residence of himself and his wife in the territory acquired from France lying north of latitude thirty-six degrees thirty minutes, and north of the State of Missouri, are each relied on by the plaintiff in error. As the residence in the territory affects the plaintiff's wife and children as well as himself, I must inquire what was its effect.

The general question may be stated to be, whether the plaintiff's status, as a slave, was so changed by his residence within that territory, that he was not a slave in the State of Missouri, at the time this action was brought.

In such cases, two inquiries arise, which may be confounded, but should be kept distinct.

The first is, what was the law of the Territory into which the master and slave went, respecting the relation between them?