What are some examples of sectionalism?
The Nullification Crisis.
The interests of the North and of the South were different. The North was growing into a more industrial region with factories, thus they had industrial interests, versus the South which had agricultural interests. These differences, along with the disputes over slavery, caused sectionalism to develop. Sectionalism brought an end to the Era of Good Feelings.
Expansion increased sectionalism by suddenly having to make the decision of slave states versus non slave states, since there had to be an equal number. it also expanded different rural responsibilities for the economy, and truthfully, it was only natural. Since the U.S was getting bigger, sectionalism was bound to increase.
Sectionalism affects the population of the United States based on the majority of American citizens only concerned with what goes on within the American borders, or what happens to citizens of the United States, whether they are here or abroad. Some believe we should not involve ourselves in matters that seemingly have nothing to do with the United States.