General who was successful at Ft. Henry, Ft. Donelson, Shiloh, Vicksburg, and Petersburg. Ultimately, he was the top general in the Union army by the end of the war. This general's military achievements were instrumental in:
a) Securing key strategic victories in the Western theater of the war
b) Preventing foreign intervention in support of the Confederacy
c) Suppressing anti-war sentiment in the Northern states
d) Consolidating Union control over Southern territories