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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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| 1951 |
| | | The first hydrogen bomb is successfully tested by the US at Enewetak Atoll in the Marshall Islands | |
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| 1953 |
| | | The first Soviet hydrogen bomb is successfully tested at the Semipalatinsk Test Site in Kazakhstan | |
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| 1962 |
| | | US intelligence reveals nuclear missile bases under construction in Cuba, causing an international crisis | |
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| 1962 |
| | | A deal between President Kennedy and Soviet premier Khrushchev defuses the Cuban missile crisis | |
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| 1972 |
| | | The SALT 1 treaty is signed by the US and USSR, limiting anti-ballistic missiles | |
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| 1983 |
| | | President Reagan proposes a Strategic Defence Initiative (SDI) against nuclear attack | |
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| 1988 |
| | | Iraqi dictator Saddam Hussein uses chemical weapons against the Kurds of northern Iraq | |
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| 2005 |
| | | The Provisional IRA announces a formal end to armed conflict and orders units to dump all their weapons | |
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| 2006 |
| | | North Korea test-fires seven missiles, of varying ranges and with varying success | |
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