Question

About what did he write a letter to Franklin D. Roosevelt?​

Answer 1

Answer:

Albert Einstein wrote a letter to Franklin D. Roosevelt to make him aware about the destruction and danger that nuclear weapons can cause.

Explanation:

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Answer 2

Answer:

In August 1939, Einstein wrote to U.S. President Franklin Roosevelt to warn him that the Nazis were working on a new and powerful weapon: an atomic bomb. Fellow physicist Leo Szilard urged Einstein to send the letter and helped him draft it.