Part 1 of Essay
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 ....

Part 2 of Essay
.... That was called "the Manhattan Project". An enormous mount of money was invested in the project. The project started in 1942 and improved step by step. Finally, on July 16th in 1945, the members of the project team experimented with the atomic bomb for the first time, and they realized that they succeeded inventing the first atomic bomb. How was it a milestone? I will explain the mechanism and the power of the atomic bomb. Ronald Takaki explains the principle of it in his book. "There is an atom that releases two ....