Answer:
The US recruited troops to fight in World War II.
Explanation:
The US were uninterested in World War II until the Japanese bombed the American fleet in Pearl Harbor, Hawaii, on December 7, 1941. This led them to enter into the war.
At this point in time the US began mass recruitment of troops to fight the war which led to the military growth and expansion of the United States.
Answer: A.
scale
Explanation: Scales are mostly used to compare and contrast, like balancing scale, or a scale from the amount of people in America and in another country.
I would say D. I'm guessing tho
I believe the answer is environment.