In Barth's time American merchants were established on the Niger, bartering goods in exchange for slaves.
Already, as may be seen by his letters to the Directory, he had laid his plans for the bartering away of the Queen of the Adriatic to Austria; and throughout the lengthy negotiations of the summer and early autumn of 1797 which he conducted with little interference from Paris, he adhered to his plan of gaining the fleet and the Ionian Isles; while the house of Habsburg was to acquire the city itself, together with all the mainland territories of the Republic as far west as the River Adige.
Dingiswayo also encouraged trade and opened relations with the Portuguese at Delagoa Bay, bartering ivory and oxen for brass and beads.
The French adventurers, bent on finding either a "North-west passage" or some land route to the Pacific (which they believed to be no farther west than the Mississippi), naturally went west by the water routes of Wisconsin; as a fine field for their bartering and trading with water-courses by which they could convey their pelts and skins back to Montreal, the region attracted the coureurs de bois and fur traders; and it seemed promising also to the zealous French Catholic missionaries.
She closed her eyes, telling herself she'd survive this and figure out how to get the hell out of there, even if it meant bartering with the monsters on her cell block.