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. As a practical illustration of the principle, we may refer to the legislation of the free States in abolishing slavery, and prohibiting its introduction into their territories. Confessedly, except as restrained by the Federal Constitution, they exercised, and rightfully, complete and absolute power over the subject. Upon what principle, then, can it be denied to the State of Missouri? The power flows from the sovereign character of the States of this Union; sovereign, not merely as respects the Federal Government--except as they have consented to its limitation--but sovereign as respects each other. Whether, therefore, the State of Missouri will recognise or give effect to the laws of Illinois within her territories on the subject of slavery, is a question for her to determine. Nor is there any constitutional power in this Government that can rightfully control her. Every State or nation possesses an exclusive sovereignty and jurisdiction within her own territory; and, her laws affect and bind all property and persons residing within it. It may regulate the manner and circumstances under which property is held, and the condition, capacity, and state, of all persons therein; and, also, the remedy and modes of administering justice. And it is equally true, that no State or nation can affect or bind property out of its territory, or persons not residing within it. No State, therefore, can enact laws to operate beyond its own dominions, and, if it attempts to do so, it may be lawfully refused obedience. Such laws can have no inherent authority extra-territorially. This is the necessary result of the independence of distinct and separate sovereignties. Now, it follows from these principles, that whatever force or effect the laws of one State or nation may have in the territories of another, must depend solely upon the laws and municipal regulations of the latter, upon its own jurisprudence and polity, and upon its own express or tacit consent.