Answer: The answer would be ''Mobilization''.
Explanation: The US army was a force that was mobilized considering the fact that many young men were needed for the war against the opposing forces which would have brought upon an end to the world as the people knew it.
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Because industry was booming more people moved to cities for jobs. So A. is a change that did NOT happen
The rest of the answers are changes that Happened
Answer:
Among the options here, this is the answer:
C. Germany printed more paper money to pay wartime reparations,
which led to hyperinflation.
Explanation: