Answer:
Supreme Court's decision on Plessy v. Ferguson of 1896 which declared segregation as constitutional, denial of political rights to black people in the Southern states, segregation of public places, burial grounds, neighborhoods and schools, etc.
Step-by-step explanation:
Even after the signing of the 13th, 14th, and 15th Amendments, Hannah-Jones say that many racial inequalities persisted in the years following the Reconstruction. She cites examples such as the Supreme Court's decision on Plessy v. Ferguson of 1896 which declared segregation as constitutional, denial of political rights to black people in the Southern states, segregation of public places, burial grounds, neighborhoods and schools, etc.
Hannah-Jones believes that institutions such as caste system and ideologies of racial superiority and lack of believe in black people's allegiance and patriotism made all these inequalities possible.