It was to spare the Japanese people from utter destruction that the ultimatum of July 26 was issued at Potsdam. Their leaders promptly rejected that ultimatum.

If they do not now accept our terms they may expect a rain of ruin from the air, the like of which has never been seen on this earth. Behind this air attack will follow sea and land forces in such numbers and power as they have not yet seen and with the fighting skill of which they are already well aware.

–President Harry Truman, Aug. 6, 1945

What is Truman’s purpose in delivering this speech?

A. to apologize to Japan for using an atomic bomb
B.to announce the terms of the Potsdam Declaration
C.to force Japan to leave the Philippines
D.to threaten Japan with further attacks if it fails to surrender