Question

shifted from the lower South to the upper South. was in Charleston, South Carolina remained, as it had been, primarily within the lower South. remained, as it had been, primarily within the upper South. shifted from the upper South to the lower South.

Answer 1

I think that the sentence is missing and I found it which is: prior to 1860, the center of economic power in the south.

The answer is: shifted from the upper south to the lower south.

Hope this helps.