Why was slavery important to the economy in the south before the civil war

Slaves were very important to the southern economy because southerners depended solely on slaves' labor.

Explanation:

Because the South's economy relied on mostly plantations which they used slaves to work on the fields. While the North had a economic state on mostly factories. This is also one of the reasons why they won the Civil War, They were able  to fabricate the most guns which were used in the war.

Explanation:

the use of email to replace slower surface mail.