I will emphasize again that even if the North just accepted secession war still likely breaks out. Remember the issue wasn't just the continuance of slavery in the states that had it but the expansion of it into new states. If the CSA survived whether through the Civil War or the ward didn't start at Fort Sumter at some point the CSA would've wanted to expand into new territory.
Yup. The fate of future territories being free states or slave states was probably the most important matter of contention leading up to the civil war.
Are you confused? I said the reason for secession was slavery in the previous post (which you quoted). Slavery doesn't demand a war, which is borne out by Lincoln's writings and speeches. The Civil War was about keeping the Union together, from Lincoln's perspective. He said if freeing no slaves would keep the Union together, he would do that. Both the CSA and the Union could have separately expanded into the continent, which territories deciding who to join, just as territories had chosen to be free or slave states prior to the war. That doesn't make the war inevitable.
Yes he did which is why I find the argument that the North were the instigators of the war both odd and not historically supported. As you acknowledge Secession was about slavery. The South could've kept slavery and for longer than what actually happened if they had accepted Lincoln's compromise. They knew that seceding was going to lead to war as that was a redline that Lincoln and others couldn't accept and they made that abundantly clear. Also the South fired the first shots too. Obviously we're talking about alternate histories but it should be clear from the lead up to the war and the failure of things like the Missouri Compromise that sharing the continent between slave states and free states was unacceptable to both sides. That there would be a USA and CSA makes it more likely that war breaks out if both try to expand.
Confederate States of America - A Declaration of the Causes which Impel the State of Texas to Secede from the Federal Union I'm gonna go out on a limb here and say it had to deal with slavery.
I have started watching the PBS Ken Burns Civil War documentary. It’s long but engaging. Regardless of why the southerners or northerners supported secession and the CSA, the root cause of the secession was the northern slave-free economy dwarfing the southern slave-led economy and northern politicians were openly hostile to the practice of slavery. Justice Tanney lit the fuse and the election of Lincoln was the explosion that led to the war. The CSA would have kept slavery as an institution and were willing to go to war over it. The USA too would have kept slavery as an institution in the south and ban it elsewhere but they were willing to go to war to preserve the union and effectively invaded the south. In the process of invasion, slavery was abolished except in situations outlined by the 13th amendment.