It is easy to use just one resource, but you will develop a better understanding of your subject if you learn from a diversity of sources.
The more you know about your topic, the better informed your final work will be.
Different kinds of resources get you different kinds of information and different points of view.
Learn enough about your topic to be able to talk about why it matters, not just demonstrate what you have found.
Know the process.
List starting requirements (number of sources, essay type, etc.)
Terrorism (at home and from abroad)
Strikes and Labor Unions
Climate Change/Global Warming
Same sex adoption
Pollution (Plastics in the oceans)