In these last-mentioned courts, where their character and rank are analagous to that of a Circuit Court of the United States; in other words, where they are what the law terms courts of general jurisdiction; they are presumed to have jurisdiction, unless the contrary appears. No averment in the pleadings of the plaintiff is necessary, in order to give jurisdiction. If the defendant objects to it, he must plead it specially, and unless the fact on which he relies is found to be true by a jury, or admitted to be true by the plaintiff, the jurisdiction can not be disputed in an appellate court.

Now, it is not necessary to inquire whether in courts of that description a party who pleads over in bar, when a plea to the jurisdiction has been ruled against him, does or does not waive his plea; nor whether upon a judgment in his favor on the pleas in bar, and a writ of error brought by the plaintiff, the question upon the plea in abatement would be open for revision in the appellate court. Cases that may have been decided in such courts, or rules that may have been laid down by common-law pleaders, can have no influence in the decision in this court. Because, under the Constitution and laws of the United States, the rules which govern the pleadings in its courts, in questions of jurisdiction, stand on different principles and are regulated by different laws.

This difference arises, as we have said, from the peculiar character of the Government of the United States. For although it is sovereign and supreme in its appropriate sphere of action, yet it does not possess all the powers which usually belong to the sovereignty of a nation. Certain specified powers, enumerated in the Constitution, have been conferred upon it; and neither the legislative, executive, nor judicial departments of the Government can lawfully exercise any authority beyond the limits marked out by the Constitution. And in regulating the judicial department, the cases in which the courts of the United States shall have jurisdiction are particularly and specifically enumerated and defined; and they are not authorized to take cognizance of any case which does not come within the description therein specified. Hence, when a plaintiff sues in a court of the United States, it is necessary that he should show, in his pleadings, that the suit he brings is within the jurisdiction of the court, and that he is entitled to sue there. And if he omits to do this, and should, by any oversight of the Circuit Court, obtain a judgment in his favor, the judgment would be reversed in the appellate court for want of jurisdiction in the court below. The jurisdiction would not be presumed, as in the case of a common-law English or State court, unless the contrary appeared. But the record, when it comes before the appellate court, must show, affirmatively, that the inferior court had authority, under the Constitution, to hear and determine the case. And if the plaintiff claims a right to sue in a Circuit Court of the United States, under that provision of the Constitution which gives jurisdiction in controversies between citizens of different States, he must distinctly aver in his pleadings that they are citizens of different States; and he can not maintain his suit without showing that fact in the pleadings.

This point was decided in the case of Bingham v. Cabot, (in 3 Dall., 382,) and ever since adhered to by the court. And in Jackson v. Ashton (8 Pet., 148,) it was held that the objection to which it was open could not be waived by the opposite party, because consent of parties could not give jurisdiction.

It is needless to accumulate cases on this subject. Those already referred to, and the cases of Capron v. Van Noorden, (in 2 Cr. 126.,) and Montalet v. Murray, (4 Cr., 46,) are sufficient to show the rule of which we have spoken. The case of Capron v. Van Noorden strikingly illustrates the difference between a common-law court and a court of the United States.

If, however, the fact of citizenship is avered in the declaration, and the defendant does not deny it, and put it in issue by plea in abatement, he can not offer evidence at the trial to disprove it, and consequently can not avail himself of the objection in the appellate court, unless the defect should be apparent in some other part of the record. For if there is no plea in abatement, and the want of jurisdiction does not appear in any other part of the transcript brought up by the writ of error, the undisputed averment of citizenship in the declaration must be taken in this court to be true. In this case, the citizenship is averred, but it is denied by the defendant in the manner required by the rules of pleading, and the fact upon which the denial is based is admitted by the demurrer. And, if the plea and demurrer, and judgment of the court below upon it, are before us upon this record, the question to be decided is, whether the facts stated in the plea are sufficient to show that the plaintiff is not entitled to sue as a citizen in a court of the United States.

We think they are before us. The plea in abatement and the judgment of the court upon it, are a part of the judicial proceedings in the Circuit Court, and are there recorded as such; and a writ of error always brings up to the superior court the whole record of the proceedings in the court below. And in the case of the United States v. Smith, (11 Wheat., 172,) this court said, that the case being brought up by writ of error, the whole record was under the consideration of this court. And this being the case in the present instance, the plea in abatement is necessarily under consideration; and it becomes, therefore, our duty to decide whether the facts stated in the plea are or are not sufficient to show that the plaintiff is not entitled to sue as a citizen in a court of the United States.

This is certainly a very serious question, and one that now for the first time has been brought for decision before this court. But it is brought here by those who have a right to bring it, and it is our duty to meet it and decide it.

The question is simply this: Can a negro whose ancestors were imported into this country, and sold as slaves, become a member of the political community formed and brought into existence by the Constitution of the United States, and as such become entitled to all the rights and privileges and immunities guaranteed to the citizen? One of which rights is the privilege of suing in a court of the United States in the cases specified in the Constitution.

It will be observed, that the plea applies to that class of persons only whose ancestors were negroes of the African race, and imported into this country, and sold and held as slaves. The only matter in issue before the court, therefore, is, whether the descendants of such slaves, when they shall be emancipated, or who are born of parents who had become free before their birth, are citizens of a State, in the sense in which the word citizen is used in the Constitution of the United States. And this being the only matter in dispute on the pleadings, the court must be understood as speaking in this opinion of that class only, that is, of those persons who are the descendants of Africans who were imported into this country, and sold as slaves.