Question: USS South America was used to block ports and waterways on states commonly referred to as what?
Sentence (from "Confederate States of America"): The Confederacy was originally formed by seven secessionist slave-holding states – South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas – in the Lower South region of the United States whose regional economy was mostly dependent upon agriculture, particularly cotton, and a plantation system that relied upon the labor of African-American slaves.
Relevant evidence: No