Source
This is the cover for George Fitzhugh's book called Cannibals All! or Slaves Without Masters. It was written in 1857 before the Emancipation Proclamation, but as the country was wrestling with slavery.
http://www.bookrags.com/George_Fitzhugh

The negro slaves of the South are the happiest, and in some sense, the freest people in the world. The children and the aged and infirm work not at all, and yet have all the comforts and necessaries of life provided for them. They enjoy liberty, because they are oppressed neither by care or labor. The women do little hard work, and are protected from the despotism of their husbands by their masters. The negro men and stout boys work, on the average, in good weather, no more than nine hours a day. The balance of their time is spent in perfect abandon. Besides, they have their Sabbaths and holidays. White men, with so much of license and abandon, would die of ennui ; but negroes luxuriate in corporeal and mental repose. With their faces upturned to the sun, they can sleep at any hour; and quiet sleep is the gretest of human enjoyments. "Blessed be the man who invented sleep." 'Tis happiness in itself-and results from contentment in the present, and confident assurance of the future.

http://faculty.chass.ncsu.edu/slatta/hi216/documents/slavery/defense1.htm