southern states seceded after Abraham Lincoln was elected president because Lincoln:
A. Declared that all slaves must be immediatly freed.
B. publicly supported john brown's raid on harper ferry.
C. refused to support the spread of slavery into new states.
D. promised that he would not use the military to stop secession
Abraham Lincoln did not at all support slavery, and the South wasn't a big fan of that. They seceded when he refused to support its spread, and the tragic Civil War began soon after.
