Why were the southern plantations able to increase their cotton production between 1790 and 1821?

Southern plantations were able to increase their cotton production between 1790 and 1821 due to the invention of the cotton gin by Eli Whitney in 1793, which significantly streamlined the process of separating cotton fibers from seeds. This innovation made cotton processing more efficient and profitable, leading to greater cultivation of cotton across the South. Additionally, the expansion of land suitable for cotton farming, coupled with the demand for cotton in both domestic and international markets, fueled this growth. The reliance on enslaved labor also played a crucial role in supporting large-scale cotton production during this period.