At the beginning of 1939, German chemist O. Hahn and physical chemist F. Strassman published papers on nuclear fission of uranium atoms. Danish physicist N.H.D Bohr and his collaborator J.A. Wheeler theoretically expounded the process of nuclear fission reaction and pointed out that the best element that can cause this reaction is the isotope uranium 235. Some scientists, led by French physicist Joliot-Curie, were forced to emigrate. Britain had made plans to carry out research in this field, but due to the war, manpower and material resources were in short supply. Later, it had to cooperate with the United States and send a team of scientists headed by physicist chadwick to the United States to participate in the development of the atomic bomb led by theoretical physicist Oppenheimer. In the United States, the Hungarian physicist Zilad Leo, who moved from Europe, first considered that once fascist Germany mastered the atomic bomb technology, it might bring serious consequences. After he and several other scientists who immigrated to the United States from Europe rushed to promote it,1In August, 939, physicist A. Einstein wrote to the 32nd President of the United States, F. D. Roosevelt, suggesting the development of an atomic bomb, which attracted the attention of the American government.

Strictly speaking, atomic bombs are made by scientists all over the world.

China's atomic bomb was first invented by Deng Jiaxian.