Answer:
A is the correct answer
Explain:
You can easily rule out D because there are still conflicts to this day. Now you have it easier to get the right answer. WW2 was the first truly modern war, in the civil war and evem WW1 they still waited to see the whites of peoples eyes before they fired. And the majority of the battles were actually fought in the north.
The Central Powers consisted of Austria-Hungary, Germany, Bulgaria, and the Ottoman Empire.
The Alliance Powers consisted of Serbia, Russia, France, the United Kingdom, Italy, Belgium, and the United States.
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The answer is A. Robert Fulton, who, although he wasn't the first one to come up with the steamboat idea, Fulton built the first safe practical model of the steamboat.