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

This letter warned the US that Germany was researching nuclear weapons and it urged the US to research them as well with the hope that the US would finish research on the weapons first. If this letter had not been received by the president, WWII could have turned out completely different than it did.