Narrative of the Life of Frederick Douglass discussion

“The challenge of the twenty-first century,” writes Davis, “is not to demand equal opportunity to participate in the machinery of oppression. Rather, it is to identify and dismantle those structures in which racism continues to be embedded. This is the only way the promise of freedom can be extended to the masses of people.”

Which social and/or political structures do you believe to be "the machinery of oppression"? How so?