Discuss ways the economies of the upper south and the deep south became dependent on each other around 1860?

The correct answer to this open question is the following.

The ways in that the economies of the Upper South and the Deep South became dependent on each other around 1860 were the following. In the Upper South, they traded slaves. They sold and transported slaves to the Deep South region because there, slaves were needed to work in the plantations. In different regions, different crops were grown. So the sale of slaves was needed to work in the fields of the South.

abraham lincoln, according to anyone who was connected with agriculture, represented the worst of northern politicians. shortly after lincoln was elected, south carolina seceded from the union. they along with other southern states, retained their anger. in a way, it was their own fault: the democrats were split in the south. some wanted slavery to be extended in other states that were about to join the union and some didn't want it badly enough. lincoln had a solid backing from his party: the republicans were united in not wanting slavery to be expanded.