Calhoun argued that slavery was natural because it had existed since the beginning of human history, and that it was justified by the fact that some races were intellectually and physically inferior to others. He believed that the white race was superior to the black race, and that blacks were naturally suited for servitude.
Calhoun also argued that slavery was necessary because it provided a stable and efficient labor force for the South's agricultural economy. He believed that the South could not survive without slavery, and that any attempt to abolish it would lead to economic disaster.
Finally, Calhoun argued that slavery was beneficial for both slaves and masters. He believed that slavery provided blacks with a home, food, and clothing, and that it protected them from the dangers of freedom. He also believed that slavery taught blacks discipline and morality, and that it prepared them for eventual freedom.
Of course, Calhoun's views on slavery were controversial, and they were eventually rejected by the majority of Americans. The Civil War was fought in part over the issue of slavery, and the abolition of slavery was one of its main consequences.