The political scenario of the world had a large part to play in the events that led to the creation of the atomic bomb. During the 1930s, Hitler’s power was on the rise in Nazi Germany, Fascist Italy was ruled over by Benito Mussolini, and Stalin presided over the Soviet Union. As a result, many scientists emigrated to Britain or the United States from Germany and Italy in this decade and played significant roles in the creation of the atomic bomb. Albert Einstein from Germany and Enrico Fermi from Italy were just two of the noted scientists who emigrated to the United States.