Narrowing My Topic

As I was trying to narrow down my topic I asked myself if it was to broad or if I should change it from "ethnicity in politics" to "race in politics".  After some research I came to the conclusion that they were pretty much the same thing.  I would say that the "race  in politics", would attract more readers in light of our current situation dealing with our presidency.  I feel it appeals more to my audience, whereas "ethnicity in politics", seems like a broader subject.  Although I will focus on both and try to distinguish one from the other.