They were the four undecided states of the Upper South, which voted Confederate after Lincoln had appealed for volunteer troops - the nearest thing to a declaration of war on a nation he didn't recognise.
I believe you're referring to the Confederate States of America, or, for short, the Confederacy.
Joined the Confederacy, that is - Arkansas, Tennessee, Virginia, North Carolina.
Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, Tennessee, Texas, Virginia, and West Virginia.
Four of them did - Virginia, North Carolina, Tennessee, Arkansas.
After the surrender of Fort Sumter in April of 1861, President Lincoln called for 75,000 volunteers to serve for three months and end the Southern rebellion. After Lincoln's announcement, the southern slave states of Virginia, Arkansas, Tennessee and North Carolina joined the Confederacy.
Between 1860 and 1861, 11 states joined the Confederacy. In order, they are South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, Tennessee, and North Carolina.
The day after the bombardment of Fort Sumter, Lincoln called for 75,000 volunteers to help suppress the rebellion. Virginia, Arkansas, Tennessee, and North Carolina joined the Confederate States of America rather than sending troops into neighboring South Carolina.
Alabama, Arkansas, Florida, Georgia, Mississippi, Louisiana, North and South Carolina, Tennessee, Texas and Virginia
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The seven original confederate states were: South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas. Later Virginia, Arkansas, Tennessee, and North Carolina also joined the Confederacy.
In total, eleven states joined the Confederate rebellion. These were, Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North and South Carolina, Tennessee, Texas and Virginia. The South made attempts to have Missouri, Kentucky and Maryland to join the Confederacy as they were slave states. None, however, did. They were termed "border states" in that they were positioned between the free Union states and the slave Southern states.
The last four states to secede were Tennessee, North Carolina, Virginia and Arkansas. The border states were Kentucky, Missouri, Maryland and Delaware, later joined by the new breakaway state of West Virginia.
The final four states (Virginia, North Carolina, Tennessee, and Arkansas) joined the Confederacy only when they learned that the fighting had started with the attack on Fort Sumter. Their hesitancy to join seems to foreshadow events that followed. Virginia and Tennessee saw the largest number of battles in the war and had extensive battle damage to infrastructure and economy. North Carolina lost more men killed than any other state.