The defendant pleaded in abatement to the jurisdiction of the court, that the plaintiff was not a citizen of the State of Missouri, as alleged in his declaration, being a negro of African descent, whose ancestors were of pure African blood, and who were brought into this country and sold as slaves.

To this plea the plaintiff demurred, and the defendant joined in demurrer. The court overruled the plea, and gave judgment that the defendant should answer over. And he thereupon put in sundry pleas in bar, upon which issues were joined; and at the trial the verdict and judgment were in his favor. Whereupon the plaintiff brought this writ of error.

Before we speak of the pleas in bar, it will be proper to dispose of the questions which have arisen on the plea in abatement.

That plea denies the right of the plaintiff to sue in a court of the United States, for the reasons therein stated.

If the question raised by it is legally before us, and the court should be of opinion that the facts stated in it disqualify the plaintiff from becoming a citizen, in the sense in which that word is used in the Constitution of the United States, then the judgment of the Circuit Court is erroneous, and must be reversed.

It is suggested, however, that this plea is not before us; and that as the judgment in the court below on this plea was in favor of the plaintiff, he does not seek to reverse it, or bring it before the court for revision by his writ of error; and also that the defendant waived this defence by pleading over, and thereby admitted the jurisdiction of the court.

But, in making this objection, we think the peculiar and limited jurisdiction of courts of the United States has not been adverted to. This peculiar and limited jurisdiction has made it necessary, in these courts, to adopt different rules and principles of pleading, so far as jurisdiction is concerned, from those which regulate courts of common law in England, and in the different States of the Union which have adopted the common-law rules.

In these last-mentioned courts, where their character and rank are analogous 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 cannot 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 pleading, 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 pleading that they are citizens of different States; and he cannot maintain his suit without showing that fact in the pleadings.