In order to conetextualize this book, it would be worthwhile to include other slave narratives in your discussion. Notable examples inclue Frederick Douglass's Narrative of the Life of Frederick Douglass and Olaudah Equiano's The Interesting Narrative of Olaudah Equiano. You might also want to include Uncle Tom's Cabin, the most famous anti-slavery novel, which was published about a decade prior to Incidents.
You might also want to include an example or two of a sentimental novel, a genre this book draws heavily upon. You might include Samuel Richardson's Pamela or Susan Warner's The Wide, Wide World.
For historical context, you should include some general non-fiction writing on...