By the sixteenth of the enumerated powers, Article I, section 8, Congress are authorized to exercise exclusive legislation in all cases whatever over such district as may by cession of particular States and the acceptance of Congress, not exceeding 10 miles square, become the seat of the Government of the United States, and to exercise like authority over all places purchased by the consent of the legislature of the State in which the same shall be, for the erection of forts, magazines, arsenals, dockyards, and other useful buildings. If any doubt existed on a view of other parts of the Constitution respecting the decision which ought to be formed on the question under consideration, I should suppose that this clause would completely remove it. It has been shown after the most liberal construction of all the enumerated powers of the General Government that the territory within the limits of the respective States belonged to them; that the United States had no right under the powers granted to them, with the exception specified in this grant, to any the smallest portion of territory within a State, all those powers operating on a different principle and having their full effect without impairing in the slightest degree this right in the States; that those powers were in every instance means to ends, which being accomplished left the subject--that is, the property, in which light only land could be regarded--where it was before, under the jurisdiction and subject to the laws of the State governments. The second number of the clause, which is applicable to military and naval purposes alone, claims particular attention here. It fully confirms the view taken of the other enumerated powers, for had it been intended to include in the right to declare war, by way of incident, any right of jurisdiction or legislation over territory within a State, it would have been done as to fortifications, magazines, arsenals, dockyards, and other needful buildings. By specifically granting the right as to such small portions of territory as might be necessary for these purposes and on certain conditions, minutely and well defined, it is manifest that it was not intended to grant it as to any other portion on any condition for any purpose or in any manner whatsoever.