What did the einstein-szilard letter warn president roosevelt about in 1939?
that the us was secretly researching nuclear weapons
that germany was researching nuclear weapons
that the us planned to use nuclear weapons against japan
that germany planned to use nuclear weapons against japan

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.

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