That in the year 1835, Harriet, mentioned in the declaration, was a negro slave of Major Taliaferro, who belonged to the army of the United States; and in that year he took her to Fort Snelling, already mentioned, and kept her there as a slave until the year 1836, and then sold and delivered her to Dr. Emerson, who held her in slavery, at Fort Snelling, until the year 1838. That in the year 1836, the plaintiff and Harriet were married, at Fort Snelling, with the consent of their master. The two children, Eliza and Lizzie, are the fruit of this marriage. The first is about fourteen years of age, and was born on board the steamboat Gipsey, north of the State of Missouri, and upon the Mississippi river; the other, about seven years of age, was born in the State of Missouri, at the military post called Jefferson Barracks.
In 1838, Dr. Emerson removed the plaintiff, Harriet, and their daughter Eliza, from Fort Snelling to the State of Missouri, where they have ever since resided. And that, before the commencement of this suit, they were sold by the Doctor to Sandford, the defendant, who has claimed and held them as slaves ever since.
The agreed case also states that the plaintiff brought a suit for his freedom, in the Circuit Court of the State of Missouri, on which a judgment was rendered in his favor; but that, on a writ of error from the Supreme Court of the State, the judgment of the court below was reversed, and the cause remanded to the circuit for a new trial.
On closing the testimony in the court below, the counsel for the plaintiff prayed the court to instruct the jury, upon the agreed state of facts, that they ought to find for the plaintiff; when the court refused, and instructed them that, upon the facts, the law was with the defendant.
With respect to the plea in abatement, which went to the citizenship of the plaintiff, and his competency to bring a suit in the Federal courts, the common-law rule of pleading is, that upon a judgment against the plea on demurrer, and that the defendant answer over, and the defendant submits to the judgment, and pleads over to the merits, the plea in abatement is deemed to be waived, and is not afterwards to be regarded as a part of the record in deciding upon the rights of the parties. There is some question, however, whether this rule of pleading applies to the peculiar system and jurisdiction of the Federal courts. As, in these courts, if the facts appearing on the record show that the Circuit Court had no jurisdiction, its judgment will be reversed in the appellate court for that cause, and the case remanded with directions to be dismissed.
In the view we have taken of the case, it will not be necessary to pass upon this question, and we shall therefore proceed at once to an examination of the case upon its merits. The question upon the merits, in general terms, is, whether or not the removal of the plaintiff, who was a slave, with his master, from the State of Missouri to the State of Illinois, with a view to a temporary residence, and after such residence and return to the slave State, such residence in the free State works an emancipation.
As appears from an agreed statement of facts, this question has been before the highest court of the State of Missouri, and a judgment rendered that this residence in the free State has no such effect; but, on the contrary, that his original condition continued unchanged.
The court below, the Circuit Court of the United States for Missouri, in which this suit was afterwards brought, followed the decision of the State court, and rendered a like judgment against the plaintiff.
The argument against these decisions is, that the laws of Illinois, forbidding slavery within her territory, had the effect to set the slave free while residing in that State, and to impress upon him the condition and status of a freeman; and that, by force of these laws, this status and condition accompanied him on his return to the slave State, and of consequence he could not be there held as a slave.
This question has been examined in the courts of several of the slaveholding States, and different opinions expressed and conclusions arrived at. We shall hereafter refer to some of them, and to the principles upon which they are founded. Our opinion is, that the question is one which belongs to each State to decide for itself, either by its Legislature or courts of justice; and hence, in respect to the case before us, to the State of Missouri—a question exclusively of Missouri law, and which, when determined by that State, it is the duty of the Federal courts to follow it. In other words, except in cases where the power is restrained by the Constitution of the United States, the law of the State is supreme over the subject of slavery within its jurisdiction.