The letter of the Einstein-Szilard warned President Roosevelt in 1939 that Germany was experimenting for nuclear weapons. The letter was written by Szilard with his two assistants Hungarian physicists (Teller and Wigner) and was signed by Albert Einstein. It stated that Germany may start making nuclear bombs and that the United States had better watch out for this.
President Franklin Roosevelt had a swift response to this and started the Manhattan Project, which was a research project that developed and produced the first atomic explosive/bomb during the time of Second World War.
There were 13( the 13 colonies)
The effects of World War II were very significant because of the death toll and devastation the war caused around the world.
<span> workers in foreign countries do U.S worker's jobs for less money</span>
