The correct answer is:
Was the "Breadbasket of the Confederacy."
During the Civil War Augusta County served as an important agricultural center as part of the "Breadbasket of the Confederacy". The whole Shenandoah Valley thrived thanks to fertile fields that guaranteed soldiers could be fed and the farms of Augusta County were part of the supply chain.
Furthermore, the Virginia Central Railroad ran through the county, linking the Shenandoah Valley to the Confederate capital at Richmond.