Respuesta :
Historians consider The American Civil War to be the first modern war. They regard it to be the first modern war because it was the first war where widespread use of mechanized and electrified devices like railroad trains, aerial observation, telegraph, photography, torpedoes, mines, ironclad ships and rifles occurred.
Answer: The idea of TOTAL WAR.
Explanation: The civil war. was considered as the firat modern war because Historians consider it the be a total war. It is considered a total war because every part of the society was involved in the war not just soldiers. It was one of the first war to be photographed and videos and this changed peoples perception about war.