It was the south who felt that they had been wronged because in their eyes the federal government was attempting to take away their right to property. The well known fundamental rights are life liberty and the pursuit of happiness, however what is lesser known is that originally when Thomas Jefferson wrote the Declaration of independence he wrote life, liberty, and property. This just goes to show how serious the federal government's actions were. The south broke because they could no longer trust the federal government to protect their right to own slaves. The south's economy depended on slaver to support itself as it was primarily an agriculturally based economy, and demanded high volumes of labor. If the federal government were to have stripped them of their right to own property (i.e. slaves) then many believed, and justly so, that they would go bankrupt, and a depression would sweep through the southern economy.
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The South had a sharp sense of having been wronged, by the federal government treating them unfairly
North
Because of the Civil War in the North, income tax was invented.
Blockade
The north
The industry was the main source of labor for the North.