Essay describing the three causes of Civil War

In my opinion the three major causes of the Civil War were State’s Rights, Sectionalism, and Slavery, in that order. You may have different opinions please write an essay describing these three causes in detail, and any other causes you may consider. Indicate whether you think the War could have been avoided (document your answer) and whether you believe the North or the South had the major advantages in the war.This paper should be between 4 pages in length.