"There was no territory within the United States that was claimed in any other right than that of some one of the confederated states; therefore, there could be no acquisition of territory made by the United States distinct from or independent of some one of the states.

"Each declared itself sovereign and independent, according to the limits of its territory.

"[T]he soil and sovereignty within their acknowledged limits were as much theirs at the declaration of independence as it is at this hour." at 526, 527.