Lone Star Junction
Lone Star Junction: Texas Ordinance of Secession (February 2, 1861)
This site gives the text of the Texas Ordinance of Secession after the election of Abraham Lincoln in 1860. It gives the reasons Texas secedes from the Union. See the parallels to the U.S. Declaration of Independence.
Henry J. Sage
Sage American History: Southern Secession
Article with primary source secession resolutions from three states including, South Carolina, Virginia and Mississippi. Each declaring intent to secede from the Union and outlining reasons for doing so.