make this sentence shorter and easier for a ten-year-old to understand
The cotton gin made it much easier and faster to remove seeds from cotton, so more cotton could be produced. The South had many cotton farms and used enslaved people to work on them, causing them to rely heavily on cotton production. The North, on the other hand, didn't have as many farms and didn't rely on cotton as much, leading to differences in economic interests that eventually caused conflict between the two regions.