The confederation of the 11 states are called Confederate States of America. Here are the members: Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Texas, and Virginia.
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Eleven states seceded to form the confederacy (though some put the number at 13).
The first seven seceded during the winter of 1860-61 (after Lincoln's election):
South Carolina
Mississippi
Florida
Alabama
Georgia
Texas
Four additional states seceded and joined them after the fall of Fort Sumter, and Lincoln's call for troops to respond:
Virginia
Arkansas
North Carolina
(Several western counties of Virginia refused to go along with the rest of the state and formed their own loyal state government, which later in the war was recognized as the new state of West Virginia.)
In addition two others states were split, with factions forming pro-Confederate governments in addition to the (predominant) pro-Union governments:
Kentucky
Missouri
South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas seceded before the attack on Fort Sumter (4.12.1861). After which Virginia, Arkansas, Tennessee, and North Carolina seceded. Missouri, Kentucky, Delaware, and Maryland were slave states that did not secede. West Virginia split from Virginia and stayed in the union. These five states are known as "border states."
Eleven southern states declared their secession and formed the Confederacy.
The Confederate States of America.
Eleven
The Confederate States of America
None, because the Confederate States didn't exist in 1857. The CSA was formed in 1861 by the Southern states that seceded from the Union, and was abolished in 1865 when the Union won the Civil War.