Why was the civil war considered the first modern war?

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.

the government created by the constitution is described as one where voters elect representatives to govern. i think that should be ur answer