The answer is:
Freetown
Freetown is a major port city on the Atlantic Ocean, with a population of 1 million. Freetown's economy revolves largely around its harbor, which is the largest natural harbor in Africa, and the third largest natural harbor in the world.
The city of Freetown was founded in 1792 by the Sierra Leone Company as a settlement for freed African Americans, liberated Africans, and West Indians slaves that arrived in the city from 1792 to about 1885.