As the themes and subjects of these books are very large, you will probably have more success with research if you focus on a narrower topic within it. Below are a few ideas for focusing your research.
Civil Rights:
Affirmative Action
Brown v. Board of Education
Employment Opportunities
Housing Policy
Voting Rights
Inequality:
Income Distribution
Gender Equality
Poverty
Social Classes
Racism:
Discrimination
Ethnicities
Minorities
Multiculturalism
Race Relations
Social Justice:
Human rights
Equal opportunity
Equity
Equal Access
Criminal Justice:
Juvenile Prosecution
Police Brutality
Profiling
Sentencing Bias
Wrongful Conviction