9.

Which event was the eventual cause to the southern states seceding?

The 1860 election of Abraham Lincoln

The raid on Harper's Ferry

The Fugitive Slave Law

The Kansas-Nebraska act

The 1860 election of Abraham Lincoln was the eventual cause for the southern states seceding. The southern states believed that Abraham Lincoln, who was against slavery, would work towards abolishing it, and they felt that their way of life was under threat. As a result, South Carolina was the first state to secede, followed by other southern states, leading to the formation of the Confederate States of America.