As the subject of social justice is very large, you will probably have more success researching it 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
- Housing Policy
- Voting Rights Act
- Americans with Disabilities Act
- Black Lives Matter Movement
Law Enforcement & Criminal Justice:
- Adult Sentencing for Juveniles
- Police Brutality
- Profiling
- Wrongful Conviction
- Mass Incarceration
- Mandatory Minimums
Immigration:
- Amnesty / Refugees
- Border Security
- DREAM Act
- Immigrant Labor
- Migrant Workers / Farm Workers
- Deportation
Income Inequality:
- Poverty
- Homeless Rights
- Social Welfare Reform
- Minimum Wage (Federal or State)
- Affordable Care Act / Health Care Reform
- Student Debt Crisis
- Labor Unions
Gender Inequality:
- Pay Gap
- Women's Health Care
- Roe v Wade
- Maternity Leave (or Paternity Leave)
- Online Harassment (example: Gamergate)
LGBT Rights:
- Marriage Equality
- Same Sex Adoption
- Obergefell v. Hodges
- Transgender Discrimination
- Conversion Camps
- Violence Against Transgender Persons
Other Cultural, Ethnic, & Gender Minority Issues:
- Portrayal in Media & Popular Culture
- Unequal Representation in Government
- Cultural Appropriation
- Erasure from History
- Genocide
- Targeted Assaults (i.e. Hate Crimes)