In proportion, the need for slave labors in the South was constantly going up. Rewarded with the high profit from cotton planting, white planters' belief in slavery was reinforced again and again by every cent they earned from the plantation system. .
When accused of keeping African Americans as slaves, some white planters even justified slavery by saying that it was better and happier for blacks to be slaves because they were inherently inferior and need to be supervised. How could anyone be happy without freedom? In the planters' mind, the blacks could be because they were not human. Each of them is "three fifths of a human" and a "talking tool" "as stated by the southern white delegates, and a tool's highest honor is to serve its master. Though theoretically, things were better in the North because of industrialization and accordingly lack of slavery, the way that society treated African Americans were still far from equal. In most northern places, while the white working class were gradually enfranchised, African Americans were getting "disenfranchisement laws " that kept them from suffrage. Furthermore, in some states, they were also not allowed to marry whites, to testify, or even to serve in the Military. If they worked in the factories, they were always overloaded in terrible working conditions, paid poorly and were subject to harsh disciplines. It turned out that the free North was not necessarily more egalitarian; they just deprived blacks in a different way.
However, blacks were not alone; Native Americans experienced even worse situations; they were totally excluded from the Anglo world. Also driven by the high profit of cotton trades, white settlers in the South were motivated to grab as much land as they could to produce cotton. At that time, there was no more land for them. So, the solution was to drive Native Americans, the indigenous inhabitants, away from their native land, all the way to the Indian Territory, which was located in the west of the Mississippi River, to open land for whites.