What was the formation known as that united secessionist American states?

The formation that united secessionist American states is known as The Confederacy. This term specifically refers to the group of eleven Southern states that seceded from the Union beginning in 1860, which included states like South Carolina, Mississippi, and Texas, among others. These states formed their government with its capital in Richmond, Virginia, and sought to establish themselves as a separate nation primarily to preserve the institution of slavery and assert their states' rights against what they perceived as overreach by the federal government.

The Confederacy was formally named the Confederate States of America. Its existence was marked by significant events, including the Civil War, which erupted as a result of these tensions between the North and South. The Confederacy aimed to maintain its sovereignty, economy, and societal structure, leading to a significant historical conflict that shaped the future of the United States.