make this shorter

Cotton, all of a sudden, became a major moneymaker for the South. With this boom in demand, they needed way more slaves to cultivate and gather the cotton. The whole topic of owning slaves became a hugely divisive matter nationwide, and it ultimately played a significant role in starting the Civil War.

The sudden demand for cotton in the South led to an increase in the need for slaves, which sparked a nationwide debate and contributed to the start of the Civil War.