Abraham Lincoln was elected by the people of the United States, in which, Lincoln promised not to interfere with the institution of slavery as conducted within the southern states, for he felt he had no Constitutional right to do so, yet, because the south lost the election, and because the south perceived that Lincoln was inimical to their principles, South Carolina became the first of eleven States that seceded from the Union, with South Carolina seceding on December 20, 1860, and later it was South Carolina that fired the first shots of the Civil War when they fired upon the Fort Sumter, a Fort held by Federal hands, that South Carolina wrongly believed belong to South Carolina and the new Confederacy.
There are many fundamental flaws within those that seceded, of which, the first is that no State, under any circumstance, can simply decide on its own, through its own State elected representatives or some other means, to just up and leave the Union, for the United States is a compact of States that have voluntarily bound themselves together into a Federal union, and hence their individual sovereignty outside of the United States, in which they are essentially their own country or their own nation, is not an option that any State can Constitutionally make by its own volition, for that option is not available to them. In addition, no State within this Union, was or is currently sovereign unto itself, therefore, even the semantics of the word "secession" are fundamentally flawed, for to secede is not permitted within the Union, so that those that "seceded" did not legally secede, in fact, they were in rebellion against the Union, and it is this rebellion, that the Union had the Constitutional right to suppress, which it did. Third, the Constitution is the supreme law of this land, its laws, treaties, debts, obligations, lands, infrastructures, and so on and so forth, are owned by the people, represented by their elected representatives of such a people, all ruled within a Constitutional government, divided into the three branches of judicial, executive, and legislative.
Further to the above points, the other forty-nine States of this Union do not have the right to force the secession of any one State from this Union, for this is a present-day compact of fifty States of which this Union is inviolable. In addition, secession or rebellion is detrimental to the continual sovereignty of the nation, for foreign adversaries in times of such, see the opportunity to interfere within this domestic Union for their own advantages, so that a Union that will not stand strongly together, endangers the Union, by inviting foreign interference. It so then follows, that certain States of this Union that have greater natural resources or significant populations or are far wealthier in aggregate than other States of this Union, lacking clarity of Constitutional law, and its sacred compact, may choose to believe that they can essentially extort terms from the other member States of the Union so as to remain within the Union, or else they will choose their own way. That belief, if it does so exist, is fundamentally flawed, it is not only disunion, not only secession in its talk, not only rebellion, but at its core, it is treason, and has no place in a country that provides its United States citizens ballots to make fairly their democratic choices.