New technology
1. Photography. This was huge during the civil war because they could take pictures of the devastation after a battle. Photos were usually taken after the battle was over and when they got all the pictures they wanted, they sold them off to others.
2. A new rifle. The brand new rifle that was made during the civil war was a key factor in who could win a gunfight. The new factors that came with the rifle were huge as well. The reload time was significantly faster. Which means they could kill people faster. The spin inside the rifle made the bullet spin making accuracy much better as well.
3. Minie Ball. The minie ball was the newest and one of the most deadliest invention during the civil war. The minie ball made rifles reload faster than ever making it crucial in a gunfight. The minie ball could easily puncture through the skin and in most cases, death was involved.