Free LandAssociated Documents (1)Main AuthorPublished YearTitleDocument TypeNumber of HypothesesNieboer, H. J. 1900Slavery as an industrial systemBook1More CiteRelated DocumentsMore By AuthorAssociated Hypotheses (1)Main AuthorPublished YearHypothesisSupportedVariables Tested Nieboer, H. J. 1900"Slavery as an industrial system only exists where there is still free land . . . and where subsistence is [not] dependent upon capital. . . . Only among people with open resources can slavery and serfdom exist" (387, 389)Supported3More CiteRelated HypothesesMore By AuthorAssociated OCMsland use