The answer would be C <span>The United State enters world war </span>
I believe that the correct answer is C. Even during the war the South was enraged by the The Emancipation Proclamation with its promise of freedom for their slaves, because the slaves were their primary work force, and as such represented their labor source. It's true, the South was very rich, but it was primarily tied up in the slave economy. When there was no slaves to work, the economy suffered.
