[Pericles]

I find William Rawle (Washington's forst choice for Attorney General) in his work, A View of the Constitution of the United States (1829), to be a good source for what the founders thought on many questions;

As to secession:

"The principle of representation, although certainly the wisest and best, is not essential to the being of a republic, but to continue a member of the Union, it must be preserved, and therefore the guarantee must be so construed. It depends on the state itself to retain or abolish the principle of representation, because it depends on itself whether it will continue a member of the Union. To deny this right would be inconsistent with the principle on which all our political systems are founded, which is, that the people have in all cases, a right to determine how they will be governed.

This right must be considered as an ingredient in the original composition of the general government, which, though not expressed, was mutually understood, and the doctrine heretofore presented to the reader in regard to the indefeasible nature of personal allegiance, is so far qualified in respect to allegiance to the United States. It was observed, that it was competent for a state to make a compact with its citizens, that the reciprocal obligations of protection and allegiance might cease on certain events; and it was further observed, that allegiance would necessarily cease on the dissolution of the society to which it was due.

The states, then, may wholly withdraw from the Union, but while they continue, they must retain the character of representative republics. Governments of dissimilar forms and principles cannot long maintain a binding coalition. "Greece," says Montesquieu, "was undone as soon as the king of Macedon obtained a seat in the amphyctionic council." It is probable, however, that the disproportionate force as well as the monarchical form of the new confederate had its share of influence in the event. But whether the historical fact supports the theory or not, the principle in respect to ourselves is unquestionable."

"The secession of a state from the Union depends on the will of the people of such state. The people alone as we have already seen, hold the power to alter their constitution. The Constitution of the United States is to a certain extent, incorporated into the constitutions of the several states by the act of the people. The state legislatures have only to perform certain organical operations in respect to it. To withdraw from the Union comes not within the general scope of their delegated authority. There must be an express provision to that effect inserted in the state constitutions. This is not at present the case with any of them, and it would perhaps be impolitic to confide it to them. A matter so momentous, ought not to be entrusted to those who would have it in their power to exercise it lightly and precipitately upon sudden dissatisfaction, or causeless jealousy, perhaps against the interests and the wishes of a majority of their constituents.

But in any manner by which a secession is to take place, nothing is more certain than that the act should be deliberate, clear, and unequivocal. The perspicuity and solemnity of the original obligation require correspondent qualities in its dissolution. The powers of the general government cannot be defeated or impaired by an ambiguous or implied secession on the part of the state, although a secession may perhaps be conditional. The people of the state may have some reasons to complain in respect to acts of the general government, they may in such cases invest some of their own officers with the power of negotiation, and may declare an absolute secession in case of their failure. Still, however, the secession must in such case be distinctly and peremptorily declared to take place on that event, and in such case--as in the case of an unconditional secession,--the previous ligament with the Union, would be legitimately and fairly destroyed. But in either case the people is the only moving power."