The northern state demanded more taxes and tariffs on southern goods then on their own or foreign goods coming into the country. Then all southern shipping had to be conducted ONLY by northern shipping. The South was not even allowed to pass their own state laws without permission from the northern led congress.

As to slaves, the south realized that slaves were not the future, and had actually created state laws to abandon slavery, by forbidding the importation of more slaves, the birth from slaves would all be gaining their freedom once they reached their majority of age twenty five. The north, at the time demanded the right and continuation of their form of slavery called servitude. Under servitude, a person would be locked into perpetual slavery paying back a monetary loan to a company or person, often forcing the servitude to extend to children and grandchildren.

Slavery was wicked and worth killing over, but servitude was a god given right of the rich north.