States' rights and the Civil War, how the conflict shifted from preserving the Union to ending slavery, and the impact on power balance post-war.
States' Rights were a central issue that led to the Civil War, with southern states seceding to defend their authority over decisions such as owning slaves without federal interference.
President Abraham Lincoln's election in 1860 prompted eleven southern states to secede from the United States due to concerns that Lincoln would challenge slavery, shifting the conflict from preserving the Union to ending slavery.
The outcome of the Civil War shifted power towards the national government, ending the right of states to secede and imposing conditions, including amendments, for readmitting former Confederate states into the Union.
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