Answer:
they were recruited to jobs vacated by men who had gone to fight in the war
Explanation:
B. and D.
I believe, but I am not 100% sure!
The correct answer here is the last option
Mahan argues clearly that a strong navy is required in order for United States to expand far beyond its shores and its territory in order to become a super power. Manifest Destiny is a belief that first referred to the destiny of the settlers to spread across North America and later beyond. Here Mahan says that in order to do that the government needs to provide supply points for its navy.
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