In the decade which forms the subject of this volume, no section underwent more far-reaching changes than did the group of South Atlantic states made up of Maryland, Virginia, the Carolinas, and Georgia, with which this chapter will deal under the name of the south. Then it was that the south came to appreciate the effect of the westward spread of the cotton-plant upon slavery and politics. The invention of the cotton-gin by Eli Whitney, [Footnote: Am. Hist. Review, III., 99.] in 1793, made possible the profitable cultivation of the short-staple variety of cotton.