"The final decision of where and when to use atomic bomb was up to me. Let there be no mistake about it. I regarded the bomb as a military weapon and never doubted it should be used" - President Harry S. Truman

In your own words, explain why this quote justifies the U. S. on dropping the bomb on Japan?

It shows that Truman believed it was the only way how the war was about to end.

Explanation:

Nuclear bomb was never used before attack on Japan.In that moment, United States was involved in war for almost four years.Many soldiers died, a lot of resources engaged and Truman realized that the war needs to fast as soon as possible.As Japan denied the capitulation, Truman believed that bombs are the only way to make them capitulate.