1. THE ATOMIC BOMB

2. Manhattan Project 1.In 1939, FDR was warned that the Nazis were attempting to build an atomic bomb. FDR wanted to create the weapon first. 2.He started the Manhattan Project.

3. Truman 1.In November 1944, FDR won his fourth presidential election. 2.But FDR died in April 1945. Vice President Harry S Truman became President.

4. Japan 1.The Japanese continued to fight even though they were going to lose the war. 2.The first atomic bomb was tested in New Mexico in July 1945. 3.Truman had to make a difficult decision.

5. Surrender 1.The Allies first issued the Potsdam Declaration warning Japan to surrender. But they refused. 2.Truman ordered the atomic bomb to be dropped on Hiroshima on August 6, 1945, and again on Nagasaki on August 9. 3.Japan surrendered on August 15, 1945.

6. Albert Einstein

7. Albert Einstein’s 1939 letter to President Roosevelt

8. J. Robert Oppenheimer (right), lead scientist for the Manhattan Project

9. President Harry S Truman

10. Colonel Paul Tibbets before taking off on Aug. 6, 1945 for the bombing of Hiroshima. (The plane was named after Tibbets’ mother.)

11. Japan

12. A replica of the atomic bomb dropped on Hiroshima (code-named Little Boy).

13. Little Boy

14. Hiroshima

19. Ruins of the Genbaku Dome in Hiroshima Peace Memorial Park marks the exact center of the explosion.

20. A replica of the atomic bomb dropped on Nagasaki (code-named Fat Man).

21. Fat Man

22. Nagasaki

26. Nagasaki before (top) and after (bottom) the bombing

27. A monument in Nagasaki marking the exact center of the explosion