Impossible for them to accomplish. If Davis had tried (or even if Lee had declared himself dictator and tried) the whole Confederacy would have collapsed into infighting and desertion.
Agreed. That is why the North "had" to win.
The South had 80 years to accomplish the task but instead of abiding by the constitution which allowed the Congress to create a law after 20 years of the signing of the consitution, they screamed state rights on this issue and then continued to build an entire economy based off of it rather than ween themselves off of it. They knew and the North knew that a great battle eventually was to be fought over this, even at the very beginning, it wasnt a matter of if but when.