The passage refers to all of the following as necessary steps following the Civil War EXCEPT ______

A．they could not make more profits from the cotton crops
B．some regions would be slave states
C．southerners were not responsible for the backwardness in the south
D．the southern states became a relatively compact political unit

A．They could employ large numbers of slaves in cotton plantations.
B．They could only produce cotton.
C．The black people could go to the north to make money.
D．They could unite the southern states.