Answer: ultural, economic, and constitutional differences between the North and the South eventually resulted in the Civil War. While there were several differences between the North and the South, the issues related to slavery increasingly divided the nation and led to the Civil War.
Or: The issue of slavery caused tension between the North and the South. ... Abolitionists believed that slavery was unjust and should be abolished immediately. Many Northerners who opposed slavery took a less extreme position. Some Northern workers and immigrants opposed slavery because it was an economic threat to them.
Or u can do both for a long answer :)