Answer:
Cotton Gin
Step-by-step explanation:
The cotton gin separated the sticky seeds from the fibers in cotton grown in the South, which made it much easier to make cotton faster and more profitable, which encouraged westward migration to new areas of the US South to grow more cotton. The number of enslaved people rose with the increase in cotton production, from 700,000 in 1790 to over three million by 1850. If you want more info just type in "how the cotton gin influenced slavery" or something along those lines