What about "sectionalism" worried some Americans

Sectionalism worried some of the major Americans too much as and when they were slowly moving close towards the civil war.

Explanation:

Sectionalism refers to obtain a distinction between the two sect of the territory. Referring to the Americans, sectionalism came into being, with the dividend of North America and South America.

The feel which bring about sectionalism among the citizen of the nation is that when they develop loyalty about a part of the nation but not towards the entire nation.

Sectionalism developed among the North Americans or simply Northerners based on slavery, as they were opposing slavery, whereas Southerners were instituting slavery.