Because of the invention of the cotton gin, slavery was less necassary because of the quick speed of the machine. It separated the cotton from the seeds.
Because pro-slavery feelings were stronger in the Deep South. In the Upper South, there was less enthusiasm for secession.
The south treated their slaves much more fairly than the deep southern states. (South example: North Carolina) (Deep South example: Georgia, South Carolina) Maryland treated their slave fairly, and they were considered a northern state.
One of the main economic reasons the Upper South seceded after the Lower South was the fear of losing their economic interests tied to slavery and cotton production. As the conflict over slavery intensified, Upper South states recognized the potential threat to their agricultural economy and the profits derived from slave labor. Additionally, the Upper South relied on the Lower South's cotton economy; their secession was motivated by the desire to protect their own economic stability and political power within a slaveholding Confederacy.
One of the main economic reasons the Upper South seceded after the Lower South was the increasing pressure to protect their agricultural economy, which was heavily reliant on slavery. While the Upper South had a more diversified economy compared to the Lower South, they still depended on slave labor for tobacco and other crops. As tensions escalated over issues like tariffs and the potential abolition of slavery, the Upper South felt it necessary to join the Confederacy to safeguard their economic interests and social order.
It was one of the slave-states of the Upper South, which were less dedicated to slavery than the Deep South.
Because pro-slavery feelings were stronger in the Deep South. In the Upper South, there was less enthusiasm for secession.
When Ft. Sumter was taken in Charleston Harbor in April 1861 by confederate troops this began the civil war.
The South were ferocious. They did not want slavery to end and feared that Abraham Lincoln would end slavery. That is why the Confederate States of America was formed.
Because it allowed slavery to continue in the Border States - slave-states of the Upper South that had stayed loyal.
Persian
The whole of the South, including the Upper-South states which stayed loyal in the war - Missouri, Kentucky, Maryland, Delaware. District of Columbia also allowed slavery, though slave-trading had been abolished there as part of the Compromise of 1850.
In the Civil War, some states were against slavery and some wanted it. The south wanted and used slaves all the time when the north hated slavery and wanted to get rid of it.