The problem with defining secession is "for" slavery is that it's complicated. I don't say that as an out, it just was. 7 state seceded initially after Lincoln's election, SC was just one of them. They specifically mention slavery as rationale. My state, FL, was third and didn't mention it at all. 4 more states joined after Ft. Sumter and Lincoln's call for troops. Their rationale was the US gov't shouldn't compel states to stay in the Union. One of my favorite quotes from this phase was Tennessean who voted first to stay in the Union, then after Sumter voted TN out because "Lincoln... made a rebel out of me." 4 more slave states opted to stay in the Union. Also, some of the leading rebels, Davis, Lee, were actually opposed to secession and only supported it once it had become fact. It's super complicated, much more than the single paragraph in most history books give it.
The problem with defining secession is "for" slavery is that it's complicated. I don't say that as an out, it just was. 7 state seceded initially after Lincoln's election, SC was just one of them. They specifically mention slavery as rationale. My state, FL, was third and didn't mention it at all. 4 more states joined after Ft. Sumter and Lincoln's call for troops. Their rationale was the US gov't shouldn't compel states to stay in the Union. One of my favorite quotes from this phase was Tennessean who voted first to stay in the Union, then after Sumter voted TN out because "Lincoln... made a rebel out of me." 4 more slave states opted to stay in the Union. Also, some of the leading rebels, Davis, Lee, were actually opposed to secession and only supported it once it had become fact. It's super complicated, much more than the single paragraph in most history books give it.