Answer:
The right answer is:
It gave the Union greater control of the Mississippi River valley.
Step-by-step explanation:
The ferocious Battle of Shiloh went on for two days, April 6-7, 1862. The Condeferates took the Union troops by surprise, but the latter managed to establish a defense line. Casualties mounted to 23,000, the bloodiest battle in American history up to that moment. A counteroffensive launched by Gen. Ulysses Grant pushed back the South´s army. As a result of this defeat, all Southern hopes to stop the advance of the Northern armies into northern Mississippi were lost.