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Memorize the time periods of these important eras
| 14517346452 | late post classical | 1200-1450 | 0 | |
| 14517346453 | Early Modern Era | 1450-1750 | 1 | |
| 14517346454 | Long 19th Century | 1750-1914 | 2 | |
| 14517346455 | 20th Century ( up to WWII ) | 1900-1945 | 3 | |
| 14517346456 | 20th Century ( post war ) | 1945-2001 | 4 |
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