Question

Why did president Truman decide to drop the first atomic bomb?

Answer 1

Answer: President Harry S. Truman, warned by some of his advisers that any attempt to invade Japan would result in horrific American casualties, ordered that the new weapon be used to bring the war to a speedy end.

Explanation:

Hope that helps

Answer 2

Answer:

to destroy Japan’s power to make war

Explanation:

We shall destroy their docks, their factories, and their communications. Let there be no mistake; we shall completely destroy Japan's power to make war. 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."