How many states were there in the American Civil War?

Before the Civil War, the situation of American States

1. Northern Free States (19): Oregon, New Hampshire, California, Minnesota, Iowa, New Jersey, Kansas, Wisconsin, Illinois, Michigan, Indiana, Ohio, Pennsylvania, new york, Maine, Vermont, Massachusetts, Rhode Island and Connecticut.

2. Slave states loyal to the Union (5): Missouri, Kentucky, Maryland, Delaware and West Virginia.

3. Southern slave rebel states (1 1): North Carolina, South Carolina, Georgia, Florida, Alabama, Mississippi, Louisiana, Texas, Virginia, Tennessee and Arkansas.