Which machine did Eli Whitney invent that revolutionized the cotton industry?

Eli Whitney invented the cotton gin, which significantly transformed the cotton industry by making the process of separating cotton fibers from the seeds much more efficient. Prior to this invention, the manual process of removing seeds from cotton was labor-intensive and slow, making it difficult for cotton to be produced in large quantities. The cotton gin allowed a single worker to process much more cotton than was previously possible, effectively increasing productivity and profitability for cotton growers. This innovation not only contributed to the growth of the cotton industry in the United States but also had far-reaching implications for the economy and the labor system, including the entrenchment of slavery in the Southern states due to the increased demand for cotton cultivation.