Check out the differences in distribution. At this point in the war the North had an extensive railway system created, that allowed them to get men, supplies, and equipment to places faster than ever before. The south did have some railroads, but most were just made for the situation, not planned and set up like the North. Also another difference between the two area's was economic advancements. The North was trained on advancing their industries through technology, the South, wanted to rely on their main source of labor, which often was african based.