The answer to this question is that the slaves that were sold at Montenegro came from three african states located in west Africa. these countries found in the west coast of Africa along the Atlantic ocean are Nigeria,Ghana, and ivory coast which by then were important trade routes of the famous Sudan empires.
Answer: The argument has often been used to diminish the scale of slavery, reducing it to a crime committed by a few Southern planters, one that did not touch the rest of the United States. Slavery, the argument goes, was an inefficient system, and the labor of the enslaved was considered less productive than that of a free worker being paid a wage.