Invented by Eli Whitney, the cotton gin ('gin' being short for engine) was a machine that quickly and easily separated cotton fibers from their seeds. Before this invention, the process was done by hand and was incredibly labor-intensive. While the machine made cotton production highly profitable and helped the textile industry boom, it had a devastating social impact: it inadvertently revitalized the institution of slavery in the American South, as plantation owners sought more labor to grow and harvest the vast amounts of cotton the machines could now process. This invention is often cited as a primary factor leading to the American Civil War, illustrating how a single technological breakthrough can have profound and often unintended social and political consequences.