Want this question answered?
Franklin Roosevelt- but he died before the atomic bomb was used. Harry Truman was the next president, and ordered the use of the atomic bomb.
President Truman.
write a letter warning him about an atomic bomb
No. He died prior to the testing of the atomic bomb. Harry S Truman was President.
He and himself only.
j.robert oppenheimer
Albert Einstein
It was mainly Albert Einstein.
He warned President Roosevelt that he believed Germany was developing an atomic bomb, so the United States should do so as well.
American scientists, under order of president Franklin Roosevelt.
There were too many casualties in that war. they wanted to end it.
V-E day