Question

What new weapons or improvements on old weapons made the Civil War the

deadliest war in U.S, history?

Answer 1

Machine guns and repeating rifles

Step-by-step explanation:

Machine guns were used in the Civil War. Compared to the powder muskets of the revolutionary war, These guns didn't need to be reloaded as often and as a result could inflict more casualties on the opposing side. They were also an all around improvement, with better accuracy then their primitive counterparts.