The Confederate States of America was formed in February 1861 by seven states which had seceded from the Union.
James Buchanan was president when seven Souther states seceded. Four more seceded after Abraham Lincoln took office.
The States seceded from the Union
Seven states seceded from the Union to join the Confederates.
After the first seven states seceded, Lincoln called for 75,000 volunteers, and this provoked four more states (including Virginia) into seceding.
seceded from the union
Seven states seceded from the Union prior to the outbreak of the Civil War: South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas. After the Civil War started, four more states seceded: Virginia, Arkansas, Tennessee, and North Carolina.
they were the slaveholding states that seceded from the Union.
The Confederate States of America
Seven seceded before Fort Sumter, and four more immediately after it. Total eleven states of the Confederacy.
None of them did. There is a link below to a question about states that seceded in the 19th century.
Eleven slave states seceded. This included Texas, Louisiana,, Mississippi, Alabama, Arkansas, Georgia, Florida, North Carolina, South Carolina, and Virginia. Virginia seceded, then West Virginia seceded from Virginia and rejoined the Union.