The correct answers are A) economic differences, C) states right's, D) social differences, and E) the issue of slavery.
The causes of sectionalism were economic differences, states right's, social differences, and the issue of slavery.
The Northern and Southern states had different political and economic conditions. Furthermore, the issue of slavery really represented a big difference between people that supported slavery in the South and abolitionists in the North. Sectionalism implied that the United States was severely divided and this was a major cause of the Civil War. Americans were loyal to their side, not to the whole nation.