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The Atomic Bomb

The Atomic Bomb. United States believed Hitler was developing an Atomic bomb . Manhattan Project. U.S. program to develop an Atomic Weapon Chief Scientist Robert P. Oppenheimer President Truman didn’t learn about program until he became President

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The Atomic Bomb

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  1. The Atomic Bomb

  2. United States believed Hitler was developing an Atomic bomb

  3. Manhattan Project • U.S. program to develop an Atomic Weapon • Chief Scientist Robert P. Oppenheimer • President Truman didn’t learn about program until he became President • 1st Atomic bomb was tested on July 16th 1945

  4. The Manhattan Project cont… • U.S. feared that an invasion of Japan would result in 200,000 American casualties – and perhaps 1-2 million Japanese casualties • U.S. considers using an “Atomic Bomb” to end the war quickly • Bomb had been developed as part of the “Manhattan Project” – beginning in 1942

  5. How to use the Atomic Bomb • Drop a bomb on and island in the Pacific to scare the Japanese into surrendering • Drop the Atomic bomb on Japanese cities

  6. United States Warns Japan • Truman told Japan they could expect a “Rain of ruin from the air” No response from Japan

  7. Fat Man & Little Boy

  8. Targets • Hiroshima: 365,000 People • Bombed dropped on August 6th , 1945 at 8:16am • Enola Gay

  9. Atomic Cloud Over Hiroshima

  10. Hiroshima • Ground temp: 7,000 degrees • Winds: 980mph • Buildings destroyed: 62,000 • Killed immediately: 70,000 • Dead by end of 1945: 140,000 • Area of total vaporization from the atomic bomb blast measured one half mile in diameter

  11. Before and After

  12. Nagasaki • 200,000 residents • Dropped on August 9th, 1945

  13. Nagasaki • 40,000 died on day of the attack

  14. Battle of Okinawa showed how determined Japan was to continue fighting Japanese had strong personal honor; many followed Samurai Code Invasion would mean 500,000 to 1,000,000 U.S. Deaths and maybe 2 – 4 million Japanese Intentionally targeting civilians was considered a war crime 110,000 civilians killed in the two bombings – 200,000 dead when Radiation poisoning deaths are added Truman was ‘out of the loop’ as Vice President – didn’t know destructiveness of bomb? Use the Bomb Not Use the Bomb

  15. Japan surrenders on September 2, 1945 • Long term effects of radiation caused cancer

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