If you've been assigned a paper or project, it's important too narrow your topic down to something manageable. For example, "Racism in the United States" is a topic that is too big to cover adequately in a 3-5 page paper. Try to narrow big concepts into specifics: choose a specific population, geographic location, time period, etc.
NOTE: Encyclopedias and Wikipedia are not generally considered college-level research material. This means you should not rely on them as sources for your projects/papers. They are excellent, though, for narrowing your topic down and for finding keywords and concepts for further investigation.
Here are a just few encyclopedias from our digital collection to help you get started on Social Justice related topics: