May 21, 1861
- Missouri declares its neutrality in the Civil War
- Confederate Congress votes to move its capital from Montgomery to Richmond.
- Sterling Price signs an agreement with William Harney, essentially handing Missouri over to federal forces.
- Confederate Congress votes to move its capital from Montgomery to Richmond.
A Chronological History of the Civil War in America1
- C. S. Congress at Montgomery, Alas, adjourned to meet at Richmond, Va., on the 20th July.
- Rebels establish the blockade of the Mississippi at Memphis, Tenn.
- A Chronological History of the Civil War in America by Richard Swainson Fisher, New York, Johnson and Ward, 1863