what was the major paradox of American society before the civil war

The American civil war was a historical war fought between the northern and the southern states. It was a 4 years war that starts on April 12, 1861, and ends on May 9, 1865. There are so many issues or clashes between Northern and Southern states that finally led these issues to war. This war had changed American Society and Constitution. These issues are related to economic interests, cultural values, the power of the federal government to control the states, and most importantly slavery system in America. The practice of the slavery system in America was one of the biggest political issues of the 19th century.  The major paradox of American society before the civil war was the American slavery system and their Freedom.