Why did sectionalism divide the north and south?

Sectionalism divided the North and South primarily due to differing economic interests and social structures. The North developed a manufacturing economy reliant on wage labor, while the South's economy was based on agriculture and dependent on enslaved labor. These differences fostered contrasting views on issues such as slavery, states' rights, and tariffs, leading to increasing tensions. Ultimately, sectionalism contributed to the breakdown of national unity and the onset of the Civil War.