What is the setting of Narrative of the Life of Frederick Douglass?

The physical setting of Narrative of the Life of
Frederick Douglass is Maryland, the state where Douglass was born, a slave
state, a border state, and where his days in bondage began and
ended.

The immediate setting changes as the narrative
progresses, from his original master, who sells him to cover up his illicit mixed blood
offspring between himself and Douglass' mother, through a series of owners, and finally
to a slavebreaker, Edward Covey, whose job it is to make a rebellious Douglass
mind.

The other important setting is the world of a slave. 
That world where your family relations are torn from you and sold, or you are torn from
them.  Where cruelty is common and discipline harsh and swift.  Douglass takes us there
in this narrative.  Any doubt readers of the time might have had about the evils of this
institution had to be shattered by his gripping accounts of beatings, enslavement, and
escape.