Sectional differences in the North and South developed in the US largely because

The federal government adopted a policy of neutrality

Their economic conditions and interests varied.

Only Northerners were represented at the Constitutional Convention

Early presidents favored urban areas over rural area

economic conditions and interests in each region varied

Explanation:

Sectionalism in the US developed because of varied interests in the form of state rights, slavery and economic interests. particularly these regions were mostly divided on the issue of slavery during the period 1800 and 1824 where the southerners were in support of slavery but the westvwas against it. this eventually led to the civil war that threatened to break the union but Abraham Lincoln played a major role in the union together after the civil war