State Rights vs. Slavery

While doing research for my individual paper for the midterm in class, I have come across something I feel worthy enough to discuss with you all on here. A major cause of the Civil War was the problems surrounding slavery. Also, one would argue that another major cause would be state rights. Couldn't one argue that these two causes are one in the same? Slavery is seen at this time in history that should be left up to the individual states to decide and therefore should be considered a state rights issue. Thoughts?