Question

(1) Who was Roosevelt? When and why did Einstein write
a letter to him ?
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Answer 1

Answer:

Einstein sent two more letters to Roosevelt, on March 7, 1940, and April 25, 1940, calling for action on nuclear research. Szilárd drafted a fourth letter for Einstein's signature that urged the President to meet with Szilárd to discuss policy on nuclear energy.

Answer 2

Answer:

Einstein wrote a a letter to Franklin D Roosevelt ,the American president and warned him that a single nuclear bomb would make a mass destruction. In this letter he wrote about the consequences of the atomic bomb.