Not states' rights to practice slavery. States' right to secede from the union.
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They only seceded because of Lincoln's opposition to slavery
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And they seceded because....?
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The North's increasing aggression towards slavery, for one. However, it was more than just a verbal, "Stop doing slave stuff." The North was using the government to hammer them, and many Southerners felt targeted.
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Which is why the South opposed the Fugitive Slave Act and the Dredd Scott case decision as they were were overreaches of federal authority. No wait, they liked those. The idea that the federal government was bullying the South is untrue. The South was overrepresented (thanks to the Three-Fifths Compromise) in Congress and more or less dominated national politics until the Civil War. They only seceded when they saw that edge in Congress about to disappear with the election of Lincoln, and thus the eventual abolition of their entire way of life, slavery. And they make no pretense of why they seceded in their secession addresses.