In my opinion, the issue of racism adds to the whole idea of segregation that you can appreciate throughout the novel. That is, the plotline is thorughly mined with backgrounds, characters and stories that complete the idea of discrimination and of being different, which is in fact what Callie´s story is all about. So if you think about it, racism is quite important in order to build a deep, meaningful storyline. Hope it´s been of use!
| 
