The residence of the plaintiff, who was taken by his master, Dr. Emerson, as a slave, from Missouri to the State of Illinois, and thence to the Territory of Wisconsin, must be deemed to have been for the time being, and until he asserted his own separate intention, the same as the residence of his master; and the inquiry, whether the personal statutes of the Territory were rightfully extended over the plaintiff, and ought, in accordance with the rules of international law, to be allowed to fix his _status_, must depend upon the circumstances under which Dr. Emerson went into that Territory, and remained there; and upon the further question, whether anything was there rightfully done by the plaintiff to cause those personal statutes to operate on him. Dr. Emerson was an officer in the army of the United States. He went into the Territory to discharge his duty to the United States. The place was out of the jurisdiction of any particular State, and within the exclusive jurisdiction of the United States. It does not appear where the domicil of origin of Dr. Emerson was, nor whether or not he had lost it, and gained another domicil, nor of what particular State, if any, he was a citizen. On what ground can it be denied that all valid laws of the United States, constitutionally enacted by Congress for the government of the Territory, rightfully extended over an officer of the United States and his servant who went into the Territory to remain there for an indefinite length of time, to take part in its civil or military affairs? They were not foreigners, coming from abroad. Dr. Emerson was a citizen of the country which had exclusive jurisdiction over the Territory; and not only a citizen, but he went there in a public capacity, in the service of the same sovereignty which made the laws. Whatever those laws might be, whether of the kind denominated personal statutes, or not, so far as they were intended by the legislative will, constitutionally expressed, to operate on him and his servant, and on the relations between them, they had a rightful operation, and no other State or country can refuse to allow that those laws might rightfully operate on the plaintiff and his servant, because such a refusal would be a denial that the United States could, by laws constitutionally enacted, govern their own servants, residing on their own Territory, over which the United States had the exclusive control, and in respect to which they are an independent sovereign power. Whether the laws now in question were constitutionally enacted, I repeat once more, is a separate question. But, assuming that they were, and that they operated directly on the _status_ of the plaintiff, I consider that no other State or country could question the rightful power of the United States so to legislate, or, consistently with the settled rules of international law, could refuse to recognise the effects of such legislation upon the _status_ of