@article{845236,
      recid = {845236},
      author = {Schermerhorn, Calvin,},
      title = {Unrequited toil : a history of United States slavery /},
      pages = {ix, 258 pages ;},
      abstract = {"The essence of United States slavery was forced labor.  Enslaved people's unrequited toil built a significant  portion of the nation's wealth. They labored in many  farming, mining, construction, transport, and factory  settings. But by the 1830s most worked in cotton fields in  the Deep South in the most important sector of the American  economy. The cotton bales they made streamed into factories  in New and old England, spun into yarn and woven into  fabric clothing people across the globe. Cotton shipped  abroad each year increased from just a few thousand bales  in 1790 to four million by 1860."--Provided by publisher.},
      url = {http://library.usi.edu/record/845236},
}