The 13th, 14th, and 15th Amendments were all signed into law during Reconstruction. What examples of persisting racial inequalities in the years following Reconstruction does Hannah-Jones mention? What institutions and ideologies made this possible?

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.

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.

c) many feel that their votes do not count eliminate

b. the passage of the equal rights amendment  

explanation:

this mean that anything that someone else could do they could do