The civil was was about slavery

The signers of the Declaration of Independence were wrong if they meant to include Negroes among "all men," said Alexander Stephens after he had become vice president of the Confederacy. "Our new government is founded upon exactly the opposite idea; its foundations are laid, its cornerstone rests, upon the great truth that the negro is not equal to the white man; that slavery . . . is his natural and normal condition. This, our new government, is the first in the history of the world based upon this great physical, philosophical, and moral truth."