If you use Actively Learn, they offer the book to rent for $2/student.
Personal experience: I only knew a little information about the history of Haiti and the Dominican Republic. When I read a novel or learn new information, I am passionate about finding out more to provide background information and more context to events in the stories. Every time we watch or read something that is outside of our zone of knowledge, we have an opportunity to immerse ourselves in new information and experiences.
Background information
The Ugly History of the 1937 Haitian Massacre
Crash Course: Haitian Revolution
Work in progress: final rubrics and writing prompts, including compare/contrast essay organization