Answer;
Charlestown
The location on the map served as an important port city along the Atlantic Coast is Charlestown.
Step-by-step explanation:
It is the oldest and largest town within the U.S. state of South geographical area, the county courthouse of Charleston County.
It is the principal town within the Charleston-North.
Charleston, SC was a vital port town above all for money crops and traffic.
Charleston was the commerce hub for the South and have become a rich town from the imports and exports returning to and from the South