Original sentence: The Confederate States of America (CSA, also known as the Confederacy) was the federation initially formed in 1861 by seven southern slave states (South Carolina, Mississippi, Florida, Alabama, Georgia, , Louisiana, and Texas) that seceded from the United States.The number of Confederate states is thus often considered to be 13.Unionist governments in Missouri and Kentucky remained loyal to the North, but rivalrous secessionist governments from those two states joined the Confederacy
Edited sentence: The Confederate States of America (CSA, also known as the Confederacy) was the federation initially formed in 1861 by seven southern slave states (South Carolina, Mississippi, Florida, Alabama, Georgia, , Louisiana, and Texas) that declared their secession from the United States.The governments of Missouri and Kentucky remained in the Union, but rival factions from those two states were also accepted as members of the Confederacy.The number of Confederate states is thus often  considered to be 13