One of the major conflicts between northern and southern states in the writing of the new constitution centered on

Explanation:

Northern interest was against the expansion of slavery, that didn't implied that they didn't wanted to happen, just they wanted to stay in the South.

On the other hand, Southern wanted to finish slavery, because this region was the most affected in this social phenomenon, but was a difficult policy, even when was ''finished'', African American people was inside a new slavery system.