The main issue that caused the civil war is slavery. Slavery is when a person or thing is being held against his or her will. Slavery was common back then before the civil war. Slaves were mostly blacks and any age. Slaves worked on plantations usually owned by rich families. While they are there they are forced to work in fields form early in the morning to late in the evening no matter the temperature.
The North then gave up on Slavery during the 1850’s. The North was modernizing