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Albert Einstein's major contribution to the Allied effort during World War II was his role in alerting the U.S. government to the potential for Nazi Germany to develop atomic weapons. In 1939, he co-signed a letter to President Franklin D. Roosevelt, drafted by physicist Leo Szilard, which urged the U.S. to accelerate its own atomic research. This letter ultimately led to the establishment of the Manhattan Project, which developed the atomic bomb. While Einstein did not directly work on the project, his advocacy was crucial in initiating the U.S. nuclear program.

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1w ago

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