The American Civil War resulted in many changes for the United States,among which were the abolishment of slavery,a rapid expansion of the national economy,and:

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The Civil War established the supremacy of the federal government over states' rights, as evidenced by the Civil War Amendments (13th, 14th, and 15th) to the Constitution, which barred slavery, granted citizenship and equal protection under the law to African Americans, and protected their voting rights. This shift in power from the states to the federal government had far-reaching consequences for the future of the country.

The American Civil War Resulted in Many Changes for the United