Final answer:
The southern states that seceded and formed the Confederate States of America during the American Civil War were South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, Tennessee, and North Carolina. Meanwhile, the border states: Delaware, Maryland, Missouri, and Kentucky, were slaveholding states that did not secede.
Step-by-step explanation:
The question pertains to the American Civil War period. Specifically, the southern states that seceded from the Union to form the Confederate States of America, and the Border States (Delaware, Maryland, Missouri, Kentucky), that were slave-holding states, but did not secede. The states that became part of the Confederacy were South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, Tennessee, and North Carolina.
South Carolina led the way towards secession and was soon followed by other states of the Deep South: Mississippi, Florida, and Alabama. Within weeks, Georgia, Louisiana, and Texas had joined them. Each of these secessions occurred under heated and divided circumstances, illustrating the lack of unanimity in the South. Virginia, despite its historic links to the Union, also joined the Confederacy, providing the Confederacy with a boost in spirit and resources.
Meanwhile, the border states: Delaware, Maryland, Missouri, and Kentucky, despite being slaveholding states, did not officially join the Confederacy. Their decision not to secede deprived the Confederacy of crucial resources and soldiers.
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