What were the three main reasons that Southern states supported slavery?

They pleaded in their favor the infancy of their business in this country, the scarcity of labor and capital, the hostile legislation of other countries toward them, the great necessity of their fabrics in the time of war, and the necessity of high duties to pay the debt incurred in our war for independence.

Explanation:

a stronger government

this is true many people think today that blacks should be slaves also known as rasisim calling them many insults from slavery the idealogy of the south still exsist in some parts but not all