[Bull Snipe]

It was one of the reasons cited in several of the Secession documents. Yes it became moot, only because none of the territories belonged to the Confederate states.

[PeaRidge]

To repeat, after secession, the “hot” issue for so many northern newspapers and activist groups (wide awakes) was no longer an issue....slavery expansion was then no threat at all...just a red meat bone for the hostile crowd.

[DiogenesLamp]

It was one of the reasons cited in several of the Secession documents. Yes it became moot, only because none of the territories belonged to the Confederate states.

Over time they all would have gone over to the Confederate side simply because of economic benefit.

If the right of states to leave the Union was recognized by default, then territories would have become new CSA states too.