Economic and social differences between the north and south, because with Eli Whitney's cotton gin invention, cotton became quite profitable. This machine was able to cut down time of seperating seeds from the cotton. However, the same time to increase in the number of plantations willing to move from other crops to cotton meant the greater need for large amounts of cheap labor, and slaves. Thus, the southern economy became one crop economy, depending on cotton and therefore on slavery. On the other hand, the northern economy was based more on industry than agriculture. In fact, the northern industries were purchasing raw cotton and turning it into finished goods. This disparity between the two set up a very large difference in economic attitudes. The south was based on a plantation system while the north was more focused on a city life. This change in the north meant that society evolved into people of different cultures and classes had to work together. On the other hand, the south continued to hold onto an antiquated social order.