Hon. J. L. M. Curry , LL.D., William Robertson Garrett , A. M. , Ph.D., Confederate Military History, a library of Confederate States Military History: Volume 1.1, Legal Justification of the South in secession, The South as a factor in the territorial expansion of the United States
Clement Anselm Evans, Ed.

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‘ [23] in case of a deliberate, palpable and dangerous exercise of other powers not granted by the said compact, the States, who are parties thereto, have the right, and are in duty bound, to interpose for arresting the progress of the evil, and for maintaining within their respective limits the authorities, rights and liberties appertaining to them.’ The States, in adopting the Constitution and surrendering many attributes of sovereignty, might have surrendered all their powers and even their separate existence. Were they guilty of this felo de se, or did each retain the equal right to judge of the failure of the government to accomplish stipulated objects as well as of the mode and measure of redress, and the means of protecting its citizens? We have held that the obvious and chief purpose of the Constitution was to invest the Federal government with such powers only as equally affected the members of the community called the Union and to leave to the States all remaining powers. The greater part of the powers delegated to the general government relate directly or indirectly to two great divisions of authority; the one pertaining to the foreign relations of the country, the other of an internal character; the purposes for which the Constitution was formed being power, security and respectability without, and peace, tranquillity and harmony within. Mr. Calhoun, in early political life, stated clearly our dual system. The American Union is a democratic federal republic—a political system compounded of the separate governments of the several States and of one common government of all the States, called the government of the United States. The powers of each are sovereign, and neither derives its powers from the other. In their respective spheres neither is subordinate to the other, but co-ordinate; and, being co-ordinate, each has the right of protecting its own powers from the encroachments of the other, the two combined forming one entire and separate government The line of demarkation between