The reason TOOMBS gave for seceding was to preserve slavery.
Sure slavery was certainly a significant part of why the South broke off, although not the only one.
All four states, South Carolina, Georgia, Mississippi and Texas, that had issued written Declarations of Causes of Secession gave issues related to slavery as their reason. Most of the text is on that issue alone. Yes Georgia and Texas also gave additional reasons. Georgia was already discussed in a previous post and the additional reason that Texas gave (briefly) was that the federal govt. "almost entirely failed to protect the lives and property of the people of Texas" against the Indian and Mexican attacks. Georgia is really the only state that spent any time discussing other issues, tariffs and other related industry protection practices, as far as I could see.
ETA: But the fact that the South had plans to institute similar tariffs to create their own industrial sector and to cover their own central govt. costs does not give any credibility to the idea that tariffs were an actual reason that the South seceeeded. (See post # 96).
Here are links to the declarations:
South Carolina
December 24, 1860
http://www.yale.edu/lawweb/avalon/csa/scarsec.htm
Mississippi
January 9, 1861
http://extlab1.entnem.ufl.edu/olustee/related/ms.htm
Georgia
January 29, 1861
http://www.yale.edu/lawweb/avalon/csa/geosec.htm
Texas
February 2, 1861
http://extlab1.entnem.ufl.edu/Olustee/related/tx.htm
For any non-Americans following this thread here's a little more background info. The Declarations of Secession were made after Lincoln won the presidency but before he took office. He had won the presidential election in November, 1860 and took office in March, 1861 -- not the following January as US presidents do now.
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