Accurate but very one-sided history.
Lincoln said the war was about whether a government of, by and for the people could “long endure.”
It seems indisputable that any consensual government that can be broken up by any sufficiently strong minority can indeed not endure very long. Such governments would probably split and resplit till the small units left became a prey to despotic governments subject to no such challenge. To expand on the words of Franklin, if the states didn’t hang together, in the long run they would assuredly hang separately.
It is the second greatest tragedy of American history that we fought our greatest war against ourselves, but the responsibility for that war lies with those who precipitated it, the fire-eaters of the South who worked for a generation to exacerbate tensions between the sections. They also managed to convince (white) southerners that slavery was not an evil to be put in the way of eventual extinction, as the southern Founders believed, but rather a positive good to be protected and spread.
1). if the North had not burdened the south with excessive taxation (tarriffs) and obscene spending they would not have wanted to get out of the union. The Urban centers of California and the North-East are doing the same today to the "fly over" territories.
2. if states could get out of the union with 90 or 95% vote of their citizens and a cooling off period of a year or two, then the Federal Government would be more careful about burdening us and over stepping, plus, many other countries would want to join our Union.