Define sectionalism and give me at least one example of it during the period leading up to the Civil War.

You can think of sectionalism as one big neighborhood dispute, and the neighborhood was the United States in the mid-1800s

Some examples

Slavery - first and foremost the most important difference between the north and south was slavery.

Representation - The north and south each wanted power to pass laws that would benefit theri section.

Tariffs - The South resented all tariffs as they relied on British imports for more of their everyday goods.