Obviously the Civil War Was Irrepressible otherwise it wouldn't have happened!

Anyway.

The Civil War was irrepressible from both a North and South perspective because slavery was too much of an important economic factor to let go of, but it also inevitably split the country economically.
In the North textile factories relied heavily on Southern cotton, and therefore slave labor. This was important because the North then sold the finished gross product to England, thereby boosting profit. However the North kept the majority of this profit. This led to economical strife, and the start of sectional strife. The North relied on slavery to get the necessary ingredients, and the South needed the North to make this finished product and send it to England. Both factors relied on slavery, whether directly or indirectly, and caused a split in economy.