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Why was the United States concerned by the launch of Sputnik in 1957

No change in size, 02:41, 24 April 2020
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<youtube>https://www.youtube.com/watch?v=aKmN7t10t48C827t59FZco</youtube>
[[File:Sputnik-02.jpg|thumbnail|left|250px|Sputnik]]
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