John C. Calhoun,
Works of John C. Calhoun
(1854)
“ The powers embraced by, or appertaining to foreign relations, are left to be regulated by the treaty-making power, or by Congress; and, if by the latter, are enumerated and specifically delegated. They embrace a large portion of its powers. But those relating to the exterior relations of the States among themselves, with few exceptions, are regulated by provisions inserted in the constitution itself. To this extent, it is, in fact, a treaty — under the form of a constitutional compact — of the highest and most sacred character. ”
