World War II began in September 1939. At first, the United States did not participate in the war because its territory was far from the center of the war. But he is not idle, secretly selling exhibitors' weapons and making huge profits from them. 194165438+On the morning of February 7th, Japan attacked Pearl Harbor. Pearl Harbor is the base of the US Navy's Pacific Fleet in Hawaii. This makes America very angry. Announced to join the anti-fascist alliance of the Soviet Union, China and other countries, and began to attack the Axis camp composed of Japanese and German. At that time, the Axis camp was in high spirits, and Germany also called many scientists to develop atomic bombs. If the research and development is successful, it will bring endless disasters to the world. In this case, the United States decided to start developing the atomic bomb.
The development of the American atomic bomb began in June 1942. It brought together the best nuclear scientists from western countries (except Nazi Germany) and mobilized more than 654.38 million people to participate in the project. It took three years and $2 billion to build two practical atomic bombs. 1945 On August 6 and 9, the United States dropped atomic bombs on Hiroshima and Nagasaki, Japan, respectively. With the Soviet troops sending troops to the northeast of China, the Japanese Emperor declared unconditional surrender on 15, ending the Second World War. It should be said that at the end of World War II, the success of the United States in developing the atomic bomb contributed greatly. However, many people don't know that the project to develop the atomic bomb was named "Manhattan Project" at that time.
At that time, this top secret project was in the charge of Roosevelt, groves, Marshall and Oppenheimer. Roosevelt kept a close eye on the progress of this project, and groves succeeded in raising the priority of this project to the highest level within 48 hours of taking office. Colonel Marshall's office, the military representative, will initially be located in Manhattan, new york. As a result, the research and development site of scientists was renamed Manhattan Project, and the entire American nuclear research program was quickly renamed "Manhattan Project". Manhattan is the center of new york. New york's major commercial, trade, financial and insurance companies are located in Manhattan, which is also the richest region in the world, so the name of this project is called Manhattan Project. This means that this project is the most important project in the United States, because the main leaders are from Manhattan.