been made by Congress the final judges of their own jurisdiction in civil cases. And that when a record comes here upon a writ of error or appeal, and, on its inspection, it appears to this court that the Circuit Court had not jurisdiction, its judgment must be reversed, and the cause remanded, to be dismissed for want of jurisdiction. It is alleged by the defendant in error, in this case, that the plea to the jurisdiction was a sufficient plea; that it shows, on inspection of its allegations, confessed by the demurrer, that the plaintiff was not a citizen of the State of Missouri; that upon this record, it must appear to this court that the case was not within the judicial power of the United States, as defined and granted by the Constitution, because it was not a suit by a citizen of one State against a citizen of another State. To this it is answered, first, that the defendant, by pleading over, after the plea to the jurisdiction was adjudged insufficient, finally waived all benefit of that plea. When that plea was adjudged insufficient, the defendant was obliged to answer over. He held no alternative. He could not stop the further progress of the case in the Circuit Court by a writ of error, on which the sufficiency of his plea to the jurisdiction could be tried in this court, because the judgment on that plea was not final, and no writ of error would lie. He was forced to plead to the merits. It cannot be true, then, that he waived the benefit of his plea to the jurisdiction by answering over. Waiver includes consent. Here, there was no consent. And if the benefit of the plea was finally lost, it must be, not by any waiver, but because the laws of the United States have not provided any mode of reviewing the decision of the Circuit Court on such a plea, when that decision is against the defendant. This is not the law. Whether the decision of the Circuit Court on a plea to the jurisdiction be against the plaintiff, or against the defendant, the losing party may have any alleged error in law, in ruling such a plea, examined in this court on a writ of error, when the matter in controversy exceeds the sum or value of two thousand dollars. If the decision be against the plaintiff, and his suit dismissed for want of jurisdiction, the judgment is technically final, and he may at once sue out his writ of error. (Mollan _v._ Torrance, 9 Wheat., 537.) If the decision be against the defendant, though he must answer over, and wait for a final judgment in the cause, he may then have his writ of error, and upon it obtain the judgment of this court on any question of law apparent on the record, touching the jurisdiction. The fact that he pleaded over to the merits, under compulsion, can have no effect on his right to object to the jurisdiction. If this were not so, the condition of the two parties would be grossly unequal. For if a plea to the jurisdiction were ruled against the plaintiff, he could