In a letter from John Adams to Thomas Jefferson in 1815, Adams wrote:
“As to the history of the Revolution, my Ideas may be peculiar,
perhaps Singular. What do We mean by the Revolution? The War?
That was no part of the Revolution. It was only an Effect and
Consequence of it. The Revolution was in the Minds of the People,
and this was effected, from 1760 to 1775, in the course of fifteen
Years before a drop of blood was drawn at Lexington. The Records
of thirteen Legislatures, the Pamphlets, Newspapers in all the Colonies
ought be consulted, during that Period, to ascertain the Steps by which
the public opinion was enlightened and informed concerning the
Authority of Parliament over the Colonies. The Congress of 1774,
resembled in Some respects, tho’ I hope not in many, the Counsell
of Nice in Ecclesiastical History. It assembled the Priests from the
East and the West the North and the South, who compared Notes,
engaged in discussions and debates and formed Results, by one Vote
and by two Votes, which went out to the World as unanimous.”
John Jay wrote in Federalist Paper no. 2:
“It has often given me pleasure to observe that independent
America was not composed of detached and distant territories,
but that one connected, fertile, widespreading country was
the portion of our western sons of liberty. Providence has in
a particular manner blessed it with a variety of soils and
productions, and watered it with innumerable streams, for
the delight and accommodation of its inhabitants. A succession
of navigable waters forms a kind of chain round its borders,
as if to bind it together; while the most noble rivers in the world,
running at convenient distances, present them with highways for
the easy communication of friendly aids, and the mutual
transportation and exchange of their various commodities.”
“With equal pleasure I have as often taken notice that Providence
has been pleased to give this one connected country to one united
people–a people descended from the same ancestors, speaking the
same language, professing the same religion, attached to the same
principles of government, very similar in their manners and customs,
and who, by their joint counsels, arms, and efforts, fighting side by
side throughout a long and bloody war, have nobly established
general liberty and independence. This country and this people
seem to have been made for each other, and it appears as if it was
the design of Providence, that an inheritance so proper and convenient
for a band of brethren, united to each other by the strongest ties,
should never be split into a number of unsocial, jealous, and alien
sovereignties.”
https://avalon.law.yale.edu/18th_century/fed02.asp
John Quincy Adams, in 1839, addressed the issue of what happens, or should happen, if a people are no longer united in their hearts, culture, religion, etc., but rather by law:
“Thus stands the RIGHT. But the indissoluble link of union
between the people of the several states of this confederated
nation, is after all, not in the right, but in the heart. If the day
should ever come, (may Heaven avert it,) when the affections
of the people of these states shall be alienated from each other;
when the fraternal spirit shall give away to cold indifference,
or collisions of interest shall fester into hatred, the bands of
political association will not long hold together parties no longer
attracted by the magnetism of conciliated interests and kindly
sympathies; and far better will it be for the people of the disunited
states, to part in friendship from each other, than to be held
together by constraint. Then will be the time for reverting to
the precedents which occurred at the formation and adoption
of the Constitution, to form again a more perfect union, by
dissolving that which could no longer bind, and to leave the
separated parts to be reunited by the law of political gravitation
to the center.”
John Jay and John Adams deliberated on what makes us a united nation; John Quincy Adams opined as to what should happen if those things were no longer present in the people united.
John Jay and John Adams wrote of the things that were, essentially, pre-conditions for the establishment of a nation, and John Quincy Adams opined as to what should happen if those pre-conditions were no longer extant.
In other words, if the pre-conditions for union were later diminished or lost completely, disunion is the preferred action. As noted in a previous post, John Quincy Adams spoke of “secession”, and the desirability of secession under the proper conditions.