What was a primary reason for the extremely high number of casualties in the Civil War compared to earlier wars?

Soldiers on both sides had very little training.

The use of new, more lethal weapons technology.

Armies were much larger than in previous conflicts.

Battles were fought in more difficult and remote terrain.

How did the introduction of rifles, instead of older muskets, change combat during the Civil War?

It reduced the need for soldiers.

The defending army would quickly become overwhelmed and retreat.

The attacking force would suffer an enormous number of casualties.

The battle would usually end quickly with a clear winner.

The new, more accurate rifles proved to be ineffective in these situations.

They always had better generals leading them.

They could use trenches and forts for cover.

They were always supplied with more ammunition.

They often had more soldiers than the attackers.

A decrease in the length of the war.

A shift toward defensive strategies.

The abandonment of cannons in battle.

An increase in the use of cavalry.