| 1951 | The Peak District becomes the United Kingdom's first National Park. |
| 1961 | Bay of Pigs Invasion: A group of Cuban exiles financed and trained by the CIA lands at the Bay of Pigs in Cuba with the aim of ousting Fidel Castro. |
| 1969 | Sirhan Sirhan is convicted of assassinating Robert F.
Kennedy. |
| 1969 | Communist Party of Czechoslovakia chairman Alexander Dubček is deposed. |
| 1970 | Apollo program: The ill-fated Apollo 13 spacecraft returns to Earth safely. |
| 1971 | The Provisional Government of Bangladesh is formed. |
| 1975 | The Cambodian Civil War ends.
The Khmer Rouge captures the capital Phnom Penh and Cambodian government forces surrender. |
| 1978 | Mir Akbar Khyber is assassinated, provoking the Saur Revolution in Afghanistan. |
| 1982 | Constitution Act, 1982 Patriation of the Canadian constitution in Ottawa by Proclamation of Elizabeth II, Queen of Canada. |
| 1986 | An alleged state of war lasting 335 yea
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