How do the historical details in this passage support the authors' claim? The text includes parts of primary-source interviews with enslaved people to illustrate the difficulty of life on a sugar plantation in Louisiana. The text includes a secondary source to explain why the enslaved people on sugar plantations worked seven days each week. The text includes primary-source quotations to show that religious beliefs eased the lives of enslaved people on sugar plantations. The text uses secondary sources to describe working conditions in the sugar fields on the plantations across the American South.