How does wheatley's use of sable impact the tone of on being brought from africa to america

The excerpt given above is taken from Phillis Wheatley's poem "On Being Brought from Africa to America". The word sable literally means color black. In this line, Wheatley uses the word "sable" to indicate sense of inferiority. The author is an African and their race color is different from the rest.

(sorry if im wrong)

The word "sable" transfers a tone of inferiority. This inferiority was imposed, by the whites, to the blacks who were brought from Africa to America.

Explanation:

The word "sable" refers to something dark, black, bad, filthy, and somber. When the author used that word, he wanted to emphasize how blacks were viewed by whites and convey a tone of inferiority and repulsion so that the reader would feel how blacks were considered.