- South Carolina (_December 20, 1860_)
- Mississippi (_January 9, 1861_)
- Florida (_January 10, 1861_)
- Alabama (_January 11, 1861_)
- Georgia (_January 19, 1861_)
- Louisiana (_January 26, 1861_)
- Texas (_February 1, 1861_)
- Virginia (_April 17, 1861_)
- Arkansas (_May 6, 1861_)
- North Carolina (_May 20, 1861_)
- Tennessee (_June 8, 1861_)
Missouri and Kentucky, though slave states, remained within the Union.