Final answer:
The six slave states along the Atlantic coast were Virginia, North Carolina, South Carolina, Georgia, Florida, and Alabama, key contributors to the plantation economy of the American South before the Civil War.
Step-by-step explanation:
The six slave states along the Atlantic coastline are Virginia, North Carolina, South Carolina, Georgia, Florida, and Alabama. These states had economies that were significantly based on plantation agriculture using African slave labor before the Civil War. They were part of the American South region, which was a major area of economic growth built on slave labor during this time. It’s important to remember that the presence of slavery was widespread across the southern states, and even some northern states had slaves, though typically in lower numbers and different capacities, such as domestic servants and dockworkers.