How did the Union blockade affect the South during the Civil War?
A. It isolated the South from its trading partners and made it impossible to continue the practice of slavery.
B. It allowed the South to assemble soldiers and launch offensives at key sites away from the coast.
C. It weakened the South immediately because the Confederate forces had no access to food and weapons.
D. It weakened the South over a few years and eventually enabled the Union army to defeat the Confederate forces.