The Middle Passage was the crossing from Africa to the Americas, which the ships made carrying their 'cargo' of slaves. It was so-called because it was the middle section of the trade route taken by many of the ships.
Muslim nobles subjected most Muslims to a miserable, difficult life of serfdom. Christians from the Byzantine Empire continually tried to convert Muslims to Christianity.
In an attempt to expose and criticize the actions of the government against enslaved populations, Helen Hunt Jackson wrote this non-fiction book in order to create critical thinking about the problem.