Answer:
A. citizens had more loyalties to their regions than the Union as a whole
C. citizens pushed for laws that benefitted their region
Explanation:
It is noteworthy that the term Sectionalism is a situation that results in giving loyalty to one's own region (section) of their country over the country as a whole. In other words, there is more allegiance to one's region than to the whole country.
As a result, there was increased tension between the North and South as citizens had more loyalties to their regions than the Union as a whole, and they pushed for laws that benefitted their region.