I believe the answer is: It Makes many people will focus only on their city or neighborhood rather than on the country as a whole.
Sectionalism refers to the act of loyalty that given to only specific region rather than the country as a whole. Because of this view, people tend to care on the general wellness of the people that they are familiar with (typically limited to the place where they grow up)
<span>Sectionalism is defined as excessive devotion to local interests and customs. It effects the U.S. economy and politics because many people will focus only on their city or neighborhood rather than on the country as a whole.</span>
Missouri Compromise, measure worked out in 1820 between the North and the South and passed by the U.S. Congress that allowed for admission of Missouri as the 24th state. It marked the beginning of the prolonged sectional conflict over the extension of slavery that led to the American Civil War.