4. The 1950s was a time of Cold War tensions, with the US and the Soviet Union engaged in a nuclear arms race.

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communism
2.
capitalism
3.
weapons
4.
shelters
5.
drills
6.
Cuban Missile Crisis
7.
Iron Curtain
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McCarthy era
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Red Scare
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and cover
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defense
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nato
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Pact
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sputnik
15.
Gagarin
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race