What aspects of the war caused many to claim that the civil war was the first "modern war? " your answer should be written in paragraph form.

The American Civil War became known as the first modern was because it was the first war to ever use modern weapons. While other wars such as the American Revolutionary War used gunpowder, the American Civil War used weapons such as the Gatlin Gun, used by General Custer, repeater rifles and pistols, and grenades.