The civil war marked a significant change in the history of human warfare, because

The civil war marked significant change because
- . The technology of weaponry gave the defense the advantage over the offense (which help the winners held an attack by through technologies in barracade)
- The complexity, size, and spatial spread of the armies on the battlefield jumped in magnitude.( it took about 2% of population from a single war)
-  The civil war was the first total war in history.

Ibelieve the answer to be e