PLEASE HELP Did the brutality of the civil war have a connection to the concept of Modern Warfare?

Explanation:

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Weaponry also changed significantly during the Civil War. The most lethal change during the Civil War was the introduction of rifling to muskets. However, a bullet from an aimed rifled musket could hit a soldier more than 1,300 meters away. This drastically changed the nature of warfare to the advantage of defenders.

Historians have described the Civil War as both a modern and a total war – modern for its use of technology, administrative efficiency, and public relations as tools of war, and total in its character as an all-consuming ideological crusade

The Civil War is often called the first modern war. For the first time, mass armies confronted each other wielding weapons created by the industrial revolution. The resulting casualties dwarfed anything in the American experience. More than 600,000 men died, the equivalent in today's population of 5 million