The entity was the Confederate States of America (CSA) (1861–1865), not "Confederation States America." It was formed by eleven Southern states that seceded from the United States.
(Missouri and Kentucky had dual governments; claimed by CSA but never fully controlled.)
The declarations of causes issued by seceding states (SC, MS, GA, TX) explicitly state: preservation of slavery as the primary motive. The Confederate Constitution (March 1861) entrenched slavery permanently (Art. I Sec. 9(4): "No law... impairing the right of property in negro slaves shall be passed").
The "Cotton Kingdom" relied on enslaved labor (4M people, 1860) producing 75% of world cotton. Planter elite feared Republican platform (Lincoln) would restrict slavery's expansion → eventual extinction.
Lincoln's election (Nov 1860) with zero Southern electoral votes convinced Deep South that their interests could not be protected in the Union. Secession began before inauguration.
Feb 4, 1861: Delegates meet in Montgomery, AL. Provisional Constitution (Feb 8). Jefferson Davis (MS) elected President; Alexander Stephens (GA) VP. Permanent Constitution (Mar 11). Capital moved to Richmond, VA (May 1861).
Four years of civil war (620,000+ dead), emancipation (13th Amendment), Confederate defeat (Apr 1865), Reconstruction. The CSA was never recognized as a sovereign nation by any foreign power (though UK/France granted belligerent status).