Actually the invention of the cotton gin made the growth of more cotton possible which also meant that more slaves were needed to pick, grow, and process the cotton. The statistics show a direct relationship between the amount of cotton grown to the population of slaves.
The invention of the cotton gin helped the production time for harvesting cotton in the Southern States. The inventor was Eli Whitney and his invention filtered out cotton plant seeds which before then had to be removed by hand.
A time when cotton is in big demand. This happened in the Southern states after the invention of the cotton-gin, when they were able to supply the huge worldwide demand for cotton, and that region very quickly turned into a cotton empire.
The invention of the cotton gin allowed for a more efficient method of separating cotton from its seeds. This allowed the South to produce more cotton at a faster rate, thereby increasing its economy and trade.