Here's the deal. Any constitution that did not recognize existing slavery rights was not going to get passed. Your choice was this, or nothing. The debates on the Constitution say this very thing.
If they had preferred dissolution, the British would have quickly scooped up the dissident colonies, and that would be that.
“If they had preferred dissolution, the British would have quickly scooped up the dissident colonies, and that would be that.”
Or dissident States. Hartford Convention nearly gave Britain that chance during the War of 1812.
New England states opposed to “Mr Madison’s War” were considering secession and an alliance with Great Britain.