Before the Civil War, many southern leaders and advocates of states' rights argued for a __________, which declared that each state had retained its sovereignty upon joining the United States.

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The doctrine of nullification was a theory espoused by some southern leaders and states' rights advocates before the Civil War, which held that states had the right to nullify, or invalidate, any federal law deemed unconstitutional by the state. This theory was rooted in the belief that the states had retained their sovereignty upon joining the union.

Before the Civil War, Many Southern Leaders and Advocates of States