Answer:
I think its D but dont take my advice!!
Explanation:
How the body worked like blood going into the brain and etc
armies could be moved quickly on railroads
information about troop movements could be relayed quickly by telegraph
hope this helps good luck
It probably would have been considered a civil war early on because the british colonies had been under the same rule until they declared independance. as soon as that happened it became a war between two, no longer one, nations.
The answer is c. One Billion.
Hope this helps. ^^