Twmmah,
Good question, and you are correct about Lincoln.
There were around 3.5 million slaves in the South in 1860 out of a population of 11 million give or take. In MS and SC, the black population was over 50 percent, while in DE (which was considered a Southern State) it was around 10 percent.
Perhaps one day Tom will let me do a class just on the War. I could get more in depth with several issues than I could in the short lectures for the survey course.
Brion