@Thomas,
I can't agree with that. While the question of the legality of secession is not resolved, the rest of the constitution is not held in abeyance. For so long as it is not positively known that secession were constitutionally acceptable, the Federal government was correct in assuming that the states at Montgomery, Alabama had entered into a confederacy in violation of the constitution.
But we're both just indulging chin music here. Essentially, the unstated position of Mr. Lincoln's government was that secession was not legal, but he did not frame it in those terms. He also did not frame it in terms of the abolition of slavery. Clever politician that he was, he framed it in terms of preserving the Union. Now, you can well say that that inferentially means that he considered secession unconstitutional, but politicians don't deal in inference. They only deal in what they have actually said. And, at all events, the states of the South were bent on a couse of war from the outset. In December, 1860, several states made application to the arsenal at St. Louis for the delivery of arms and munitions, before having passed secession ordinances. The war was about slavery, there can be no doubt. The election of Lincoln spurred several southern states to begin to prepare for war even before seceding from the Union. This was because they saw Lincoln as the abolitionist candidate. Never mind that he had no power to accomplish that himself, nor that there was not sufficient votes in Congress to pass an amendment to abolish slavery, nor sufficient states to ratify such an amendment. The hot-headed South was bent on war, they levied war on the Federal government while both Buchanan and Lincoln continued to act in a conciliatory manner, and they brought down upon their own devoted pates the might of the industrial North, carried as arms by their more numerous population, and thereby lost the war. They've been whining about it ever since. And,
reality being what it is, the question of secession became moot, and their appeal to the tenth amendment effectively negated that amendment, until the Reagan era flirtation with a concept of states' rights--at which time the issue of secession did not come up.