After the civil war, slavery came to an end in the south, andthe population sharply decreased. a new labor system was needed. prejudice and racism decreased. the agricultural economy improved.

The answer is b) A new labor system was needed

The economy of the much of the Southern United States was based on the use of slaves in the large plantations.

With the end of Slavery, racism and prejudice did not cease to exist. However, legally, new labor system would be needed in order to ensure that the large agriculture industry survives and thrives in the coming years.