Towards the end of World War II Japan was refusing to surrender even with them being the last ones left of the Axis side. The U.S was trying to come up with something that could end the war as fast as possible. That's when they had the idea of using their new weapon. The two bombs they made started st Tinian in Mariana Islands and traveled to two chosen locations.
B-29 Superfortress (The plane used to drop the bombs)
On August 6, 1945 the first bomb was dropped on Hiroshima. 3 days later on Nagasaki. The death toll reached from 100,000 to 200,000. But who created these WMDs?
Robert Oppenheimer was I guess you could say " in charge" with the construction of the bombs. He worked with many other scientists to finish the project and had contributed a lot.
Ernest Lawrence helped greatly in the quest for creating the bombs. Uranium which was very hard to find and very rare. But they wouldn't be able to do anything with it unless they could separate the isotopes. Ernest Lawrence was the person that found out how to separate them and this really helped with the development of the bomb.
J Ernest Wilkins Jr had helped a lot also with his experience in engineering he had from college and had used his knowledge to further the progress of the Manhattan Project.
Overall the Manhattan Project had over 130,000 people employed and had costed $2 Billion. It went a long way and ended up changing the world forever by creating these crazy weapons that could unleash mass destruction upon countries.