Whether the Supreme Court could review the Circuit Court's jurisdiction even though the court had rejected Sandford's plea in abatement and Sandford then pleaded to the merits.
Holding
Yes. Federal jurisdiction could not be created by waiver, consent, or a party's failure to persist in a jurisdictional objection, and the whole record was before the Supreme Court on the writ of error.
Reasoning
The Court emphasized that federal courts are courts of limited and enumerated jurisdiction. A plaintiff invoking diversity jurisdiction must affirmatively show on the record that the case falls within the Constitution and statutes granting federal judicial power; jurisdiction is not presumed as it ordinarily is in a court of general jurisdiction.
Because the plea in abatement and the ruling on it were part of the record, the Court concluded that it had a duty to determine whether the Circuit Court had authority to hear the case. Sandford's later pleas on the merits could not waive a defect in subject-matter jurisdiction.
The Court also maintained that, on review of a federal circuit court judgment, it could examine the full record and correct additional jurisdictional errors. It distinguished review of a federal circuit court from review of a state-court judgment, where the Supreme Court's own appellate jurisdiction must first be established.