Why is it an unsatisfactory argument that the Civil War began primarily as a southern fight to defend liberty and the right of self-government?

Question

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The historical record shows that the primary reason for southern secession and war was the desire to protect and expand the institution of slavery. While some southern leaders spoke of defending liberty and self-government, these arguments were often framed in the context of protecting slavery. Additionally, the Confederacy did not establish a monarchy or dictatorship, but rather a government that closely resembled the U.S. Constitution.

Why Is It an Unsatisfactory Argument That the Civil War