How does the author use juxtaposition in the novel, The Third Life of Grange Copeland?

Walker juxtaposes the lifestyles of the city and country cousins, stressing the drab, flat, and stagnant Georgia landscape surrounding and enslaving the share cropping Copelands, in contrast to the color, heights, and movement that animate the cousins' urban world. These cousins impress upon Brownfield the inferiority of his life and shock him with accounts of his family's conflicts: his father Grange's debts to his white boss, Mr. Shipley; his mother Margaret's dream of leaving Grange and moving north to Philadelphia, so that Brownfield could attend school and enjoy a comfortable lifestyle; the strain that Grange's alcoholic binges place on the family's finances; and Grange's attempts to break out of debt by pressuring his wife to prostitute herself to Shipley.