Answer:
one of the answers is mass reproduction
Explanation:
Answer:
Over 30 nations declared war between 1914 and 1918. The majority joined on the side of the Allies, including Serbia, Russia, France, Britain, Italy and the United States. They were opposed by Germany, Austria-Hungary, Bulgaria and the Ottoman Empire, who together formed the Central Powers.
Explanation:
I don't know the answer but I know what's NOT THE ANSWER