How did sectionalism (loyalty to the well-being of one's own region rather than that of the whole country) lead to the start of the civil war?

Sectionalism was one of the most significant causes of the Civil War. This is due to the fact that the North and South had very different views on the institution of slavery. At this time, many Northern politicians did not want the institution of slavery to spread to the new territories we were acquiring. This is because an increase in slave states would give Southern politicians more power in Congress to make laws that they deem appropriate. The Southerners had the opposite view, as they wanted slavery to exist in all new states the US acquired. This issue would be one of the leading causes of the Civil War.

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.