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A. B. C. D

B. to avoid a bloody and costly invasion of Japan

C. to send a message of military strength to the Soviet Union

Explanation:

The Allied plan to invade the Japanese home islands was predicted to have caused hundreds of thousands of casualties if it were to have been carried out. The atomic bombing of the cities of Hiroshima and Nagasaki further forced Japan into an unconditional surrender to prevent further casualties on both sides.

Although not its direct or stated intention, some historians say the atomic bombings were a show of force that also served to dissuade Soviet Union influence in East Asia.

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.