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Overview

The main objective of this AP® United States History Period 5 guide is to explain how and why the Civil War came about and how the aftermath impacted the lives of U.S. citizens. Through the expansion of land across the continent due to the Mexican-American War, a great legal and moral debate was reignited. Many had thought that the compromises between slave states and free states had been resolved. By the 1850s, new land, new political parties, and more entrenched resistance to the opposing viewpoints would result in a war that many historians feel had become inevitable.

Read more about the idea of Manifest Destiny, the Civil War, and more.

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