Question

The South will not be able to maintain its agriculturral output until it developed a new system to replace

Answer 1

Slavery. They would need a system to replace slavery after it was abolished thanks to the Civil War

Answer 2

Although you have not given any options to choose from or have not provided any background information about the question, I believe the most applicable answer is "Slavery".

Step-by-step explanation:

Slavery was the main driver of economy in the south as the economy was heavily relying on plantations. Because of this, when the Slavery was abolished, Southern states went to war with the union as they felt their economy and the way of life was threatened.