Which of the following historical developments during the nineteenth century best supports potter's argument about the underlying cause of sectional conflict?

a. the expansion of voting rights for white males
b. the increase in economic opportunities in the west
c. the influx of irish and german immigrants to northern cities
d. the increasing prominence of the whig party in national politics

Answer is B. the increase in economic opportunities in the west.

Explanation:

Sectional conflict or crisis can simply be explained as crisis limited to a particular region, territory or community.

A typical example of a sectional crisis or conflict was the one that occurred in United states concerning slavery in 1850s, where a debate ensued whether to allow the expansion of slavery into the western region.

well i'm late but i think its: b, c, and e

a would be the answer