The graph shows cotton production and slavery in the US from 1790 to 1860. Greuth of Cotton Production and Slavery in the US from 1790 to 1860.

What does the graph indicate about the relationship between cotton and slavery?

As enslaved workers learned new skills, farmers planted more cotton.
As cotton became more popular, more workers were needed.
As enslaved workers gained more freedoms, cotton production increased,
As cotton became more difficult to grow, more labor was required.