Outline of points and evidence:
First Point: The South seceded from the Northern states because the Southerner's felt that slavery was necessary to their economy.
Source: “Secession Ordinances of 13 Confederate States” (1861). Retrieved from http://www.digitalhistory.uh.edu/disp_textbook.cfm?smtID=3&psid=3953.
Second Point: Southern soldiers fought in the Civil War to reserve their liberty and to avert abolition.
Source: Hopkins, David (1861). “Reflections on the War’s Causes” (1861). Retrieved from http://www.digitalhistory.uh.edu/disp_textbook.cfm?smtID=3&psid=401.
Third Point: During the 1850s, controversy about the expansion of slavery