Why did some southern states begin to talk of succession?

Some southern states began to talk of secession in response to growing tensions over slavery and states' rights, particularly following the election of Abraham Lincoln in 1860. They feared that his presidency would lead to the abolition of slavery, which was integral to their economies and social order. This sentiment was fueled by a belief that states had the right to govern themselves and decide their own laws, including whether to allow slavery. Ultimately, these factors contributed to the decision of several southern states to secede from the Union, leading to the Civil War.