Why did the military grow so quickly between 1940 and 1941?

The economy was poor and people needed jobs.

The US recruited troops to fight in World War II.

The US was preparing for war with England.

The draft required women to join the military.

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.

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