| Event | (4)0s or (5)0s |
|---|
| Korean War began | |
| Chemical structure of DNA discovered | |
| Microwave oven invented | |
| George Orwell published 'Nineteen Eighty-Four' | |
| Mahatma Gandhi assassinated | |
| First atomic submarine launched | |
| Buddy Holly released 'Peggy Sue' | |
| First successful kidney transplant | |
| Princess Elizabeth became Queen | |
| First modern credit card introduced | |
| NATO established | |
| 'LEGO' toy bricks introduced | |
| UN founded | |
| Warsaw Pact signed | |
| UNICEF founded | |
| D-Day | |
| Soviet satellite Sputnik launched Space Age | |
| First atomic bomb tested | |
| Mount Rushmore completed | |
| Segregation ruled illegal in US | |
| Captain America comic first appeared | |
| First commercial color TV program | |
| Report said cigarettes cause cancer | |
| China became communist | |
| Operation Barbarossa | |
| Peace symbol created | |
| 'Casablanca' movie released | |
| Polaroid cameras invented | |
| Korea divided into North and South | |
| Disneyland opened | |
| Korean War began | |
| Chemical structure of DNA discovered | |
| Microwave oven invented | |
| George Orwell published 'Nineteen Eighty-Four' | |
| Mahatma Gandhi assassinated | |
| First atomic submarine launched | |
| Buddy Holly released 'Peggy Sue' | |
| First successful kidney transplant | |
| Princess Elizabeth became Queen | |
| First modern credit card introduced | |
| NATO established | |
| 'LEGO' toy bricks introduced | |
| UN founded | |
| Warsaw Pact signed | |
| UNICEF founded | |
