#1 It wasn't a Civil War; it was a War of Secession. A civil war is between factions who want to take over the government. The South wasn't after that; it wanted to leave and be independent.
#2 Slavery was not the main reason for the War of Secession. While it was certainly one of the issues, the primary reason was states rights: the sovereignty of the states, and the powers of the states versus the encroaching federal powers.
As a Southerner, I'm tired of these myths.
It was about the right to maintain an economy based on slave labor and to expand it into new territories. As an American I'm tired of these Southern myths.