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Splitiing atoms became possible
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Einstein and several other scientists told Roosevelt of efforts in Nazi Germany to purify uranium-235, which could be used to build an atomic bomb and made the U.S undergo project Manhattan.
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President Roosevelt authorizes the Manhattan Engineering District with $2 billion to build the atomic bomb.
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"Oppenheimer thought it would take 50 scientists. He started with 500 and in the end, had 5,000 involved. One of the biggest contributers was a man named General Leslie Groves, he was appointed director of the Manhattan Project."
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Planes were being remodeled by the military to carry and drop bombs
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(The invasion of Japan) The plan would have cost a massive toll in american lives lost. It was estimated 1.7-4 million americans would be kill
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The explosion left only green radioactive material where it exploded and residents hundreds of miles away could see the blast.
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"Little Boy killed 90,000–166,000 in Hiroshima in the first 2-4 months and about half the deaths occured in the first day. Of those who died on the first day, 60% died from flash or flame burns, 30% from falling debris and 10% from other causes. during the following months many died of radiation sickness, burns, and other injuries"
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Within a few months of dropping the Atomic bomb 60,000–80,000 people were killed in Nagasaki.
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"There were groups working on the structure and firing mechanisms while others worked on production of the fuel. The volume of U-235 used in the first atomic bombs could be held in your hands. The result was an explosion equivalent to 40,000 conventional bombs."
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In the morning on September 2nd, 1945, aboard the USS Missouri in Tokyo bay, Japan officially surrendered