Wrong, I read the whole thing. He summarized and concluded his remarks with the core issue of the day for the secessionists, state sovereignty; and the core issue for the central government supremacy crowd, domination and control.
Just as I stated in my earlier post.
You chose the source to link to, it’s yours to defend or reject.
Alexander H. Stephens, Corner Stone Speech, ninth paragraph. For the south slavery was the core issue that led to their insurrection.