History of the United States II / Unit 12 USH2 1700 short lesson, about 20 seconds
The Manhattan Project
Captions available
The idea
Urged by Albert Einstein, Roosevelt launched atomic research; the Manhattan Project at Los Alamos employed one hundred fifty thousand people and cost some two billion dollars.
In practice
The first controlled nuclear chain reaction, in Chicago on December second, nineteen forty-two.
Where people slip
The bomb was first tested in New Mexico on July sixteenth, nineteen forty-five; the Yawp says fear of a German bomb began it.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
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