In order to establish military base to protect United States interest is the reason of political and military leaders want the United States to expand into the Pacific. Hence, option D is correct.
What is a military base?
A location where soldiers are trained, and military equipment is stored. Military base is the area where soldiers take the spot to halt themselves for certain period of time.
At the time of war, solider make military base in the deep area so that the enemy cannot find them.
Thus, option D is correct.
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