C. They wanted to ensure that Japan would not fall to communism.
When the United States entered World War Two, There two allies of Germany were Italy and Japan. Mussolini and Hitler had met and signed a treaty,same with japan.
They are direct and representative.
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The build up of the us military in 1916 was an example of : D. Preparedness
Which means that it's the period where U.S military took many precautions/measures to face potential threat or disaster from outside
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