Yes
It was the most modern war at the time.
Both the American Civil War and World War One have been called the First Modern War.
This is a difficult question to answer because the term "modern" is subject to argument, but the American Civil War has been called the first modern war in the history of the world. In the opinion of this contributor, this claim is true in some ways.
No. There's a reason it is called the first modern war. Bows fell out of favor among major world powers about 200 years before the Civil War began.
The magnetic compass was the first invention that might be called modern.
The Chinese civilisation was the first to have a civil service where joining it was open to anyone who could pass the entrance examination. As such it was the first modern civil service system.
Eisenhower
it used the first submarine in battle
It was also called the First Battle of Bull Run.
The Spanish Civil War (1936-39)
no it is called the bill of rights
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.