What reason does senator calhoun argue slavery is good and necessary ? According to Senator Calhoun, why is slavery better than being a poor European tenant?

"Never before has the black race of Central Africa, from the dawn of history to the present day attained a condition so civillized and so improved, not only physically, but morally and intellectually" Explain this statement.

"I hold that in the present state of civillization, where two races of different origin, and
distinguished by color, and cother physical. differences as well as intellectual What does Calhoun imply by "intellectual (differences]?"