The Invention of the Atomic Bomb And Its Use In 1945, the first atomic bomb in the world was dropped on Hiroshima. There is still discussion that the dropping was really necessary or unnecessary. I think that America should not have dropped the atomic bomb because I can not understand the necessity of the dropping of the atomic bomb for America.Then, why did America invent the atomic bomb? The reason had very much to do with the World War?. America was the first country that succeeded inventing this weapon, and that invention was epoch-making at that time. In fact, the able doctors in Germany, which was the enemy of the Allie