MAIN IDEA: As the nation expanded in population and toward the Pacific, sectional divides - especially over slavery - increased hostilities that ultimately led to the Civil War. The war brought about the preservation of the Union and the freedom of the slaves, but its effects and attempts at political and social reform during Reconstruction would leave a lasting impact for generations.
This period is "DIVIDED"
What you need to know: Period 5
Nice overview!
Interesting piece!