There were 11 states that seceded to form the Confederate States of America :
(see related question)
Eleven
because
The Confederacy was not a state. It was a group of states that declared themselves as a nation separate from the United States. The states that joined it were slave states.
border states
The states that seceeded from the United States in the early 1860s officially called themselves The Confederate States of America, but they are commonly referred to as the Confederacy or the Confederate States (or CSA).
11 states were part of the confederacy in 1865 .
13
There were seven states in the Confederacy. The states in the Confederacy included South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas.
Eleven
Eleven
The Confederacy lost the United States Civil War.The states formed a confederacy. We joined the confederacy.
11
Eleven
The southern states were the Confederacy. All the states from Virginia down to Texas, Florida, Mississippi etc. were in the Confederacy.
http://en.wikipedia.org/wiki/Confederate_States_of_America
Eleven southern states declared their secession and formed the Confederacy.
The Slave Holding States of the Confederacy.