I don't think it's necessarily the language that is used, but the meanings we attach to these words and the ideas we attach to people. One group may use the N word to greet a friend, while the other may use it as a racial slur. Because of the ideas we have about a certain race or person, it causes us to avoid people; divide us.
Yes, the racial divide is perpetuated by the language we use, because people use words that do not bring us together. Even each race has their own derogatory terms for their own. This does not help us get over racism. We should also learn English to the best of our abilities, to ease communication.
The racial divide is perpetuated by the language we use. Everything we say will either decrease or increase the racial divide we are experiencing in USA and other places around the world. As we watch news, media and movies, more and more racism continues because of the language we use. Just listen to songs now days, and then you will realize how much racism is still active. That is just an example of many more that are pure evident in our society.
While I do think that racist language of the past should definitely stay buried there, it is interesting how politically correct language (African-American, for instance) creates a weirdly cautious "walking on eggshells" kind of atmosphere. This can make the issue of our own national identity feel weirdly partisan. Better, I think, to focus on what we have in common and not what makes us separate.
The racial divide is nothing more than outside sources such as the main stream media coming between people. If at any time the races seem to be getting along and grouping together, something major happens that the media follows constantly to divide everyone back up. If the media would instead put stories about races coming together then people would get along better.