The Confederate States of America
Below is a list of the 11 states that seceded from the Union during the American Civil War, along with the date of secession and when they were readmitted.
NOTE: Four other slave states—Delaware, Maryland, Kentucky, and Missouri—remained in the Union. The latter two were actually represented on the Confederate flag, which, like the Stars and Stripes, featured a star for every state.
1. Date of readmission to representation in U.S. House of Representatives.
2. Second readmission date. First date was July 21, 1868, but the representatives were unseated March 5, 1869.