The correct answer is D) The blockade made it difficult and most times impossible for the Confederates to receive supplies.
The Union blockade of southern ports affected the Confederacy during the Civil War in that the blockade made it difficult and most times impossible for the Confederates to receive supplies.
One of the best strategies that the Union Army used during the Civil War was the blockade of southern ports that heavily affected the Confederacy troops stationed there. This military measure made it difficult and most times impossible for the Confederates to receive supplies.
For instance, that was the case of the blockade of Vicksburg, Mississippi. After many months of battle, the Union Army blockade resulted in a victory that allowed the Union to control the main ports along the Mississippi River.