What technological changes caused the civil war to be so costly in terms of human lives and injury? a. aircraft technology was just invented and the south was able to use airplanes for the first time in military history. b. advances in weaponry like the rifled barrel increased accuracy and firing ability of the guns. c. the invention of the internal combustion engine allowed for gasoline powered vehicles to be used on the battle field. d. muskets, which were high powered and accurate were being used for the first time in military history.