What strategy does Toni Morrison use to develop the main theme in Sula?

The main theme of Sula by Toni Morrison is racism, the suppression of African Americans, and the correlated ideology of bigotry. In order to develop this thematic concern, Morrison uses thematic elements that illustrate poverty and the hopelessness that an impoverished life and dream-crushing restrictions almost inevitably lead to. She also develops her main theme by exploring and illuminating the metaphysical and moral battle between good and evil while attempting to redefine how good and evil are understood. Morrison also turns the examination inward to the African American community to explore how racism, bigotry and restriction affect family relationships, especially between mothers and daughters.