Order of southern walkout at the 1860 Democratic conventions in Charleston, SC and Baltimore, MD:

Charleston (April 23, 1860) —  South Carolina, Mississippi, Florida, Alabama, Georgia,  Louisiana, Texas, Arkansas

Baltimore (June 18, 1860) — Virginia, North Carolina, Tennessee

Delegations split on walkout — Missouri, Kentucky

Did not leave — Maryland, Delaware

Order of southern secession from the union, December 1860-April 1861:

First wave (December 18th, 1860 – February 1st, 1861) — South Carolina, Mississippi, Florida, Alabama, Georgia,  Louisiana, Texas

Second wave (April 17th – May 1st, 1861) — Virginia, Arkansas, North Carolina, Tennessee.

Did not leave — Missouri, Kentucky, Maryland, Delaware.