Here are some general topics:
Ways to narrow your topic:
Consider these questions:
These questions may generate ideas. Next brainstorm. Which topics are most worthy of your time? Why is your topic significant? What angle might you take to fulfill the requirement: informative, persuasive, etc. Consider making your topic specific. For example:
What parts of Obama-care are working? What are the effects on people who previously had no health care benefits?
Avoid over-done topics. When you are narrowing your topic choices, try to choose something fresh and interesting.