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| 1950 |
| | | In response to the Soviet atom bomb, President Truman announces a crash programme to develop a hydrogen bomb | |
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| 1950 |
| | | A witch hunt begins when Senator Joseph McCarthy says he knows the names of 205 Communists in the US State Department | |
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| 1950 |
| | | Julius Rosenberg is arrested on suspicion of being a Soviet spy, and his wife Ethel is arrested a few weeks later | |
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| 1951 |
| | | The first hydrogen bomb is successfully tested by the US at Enewetak Atoll in the Marshall Islands | |
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| 1952 |
| | | A left-wing coup brings Paz Estenssoro to power and launches a 12-year revolution in Bolivia | |
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| 1953 |
| | | Imre Nagy becomes prime minister of Hungary, but is driven out of office two years later by hard-line Communists because of his relative liberalism | |
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| 1953 |
| | | US citizens Julius and Ethel Rosenberg are sent to the electric chair as convicted spies | |
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| 1953 |
| | | The first Soviet hydrogen bomb is successfully tested at the Semipalatinsk Test Site in Kazakhstan | |
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| 1954 |
| | | Senator McCarthy's Communist witch-hunt is broadcast live for several weeks on US television | |
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| 1954 |
| | | J. Robert Oppenheimer, the 'father of the atomic bomb', is investigated for Communist sympathies and his security clearance is withdrawn | |
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