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Well, the term imperial comes from empire, so the imperial era lasted until no country had or was trying to gain an empire. You should take colonies into account, but it is important to recognize that WWII was an attempt by Germany, Japan, and co. to establish empires. By that definition, the modern imperial era extended from the 15th to the 20th century. You may also take into account the more ancient Roman, Persian, and French (Alexander the great) empires. I am fairly certain my answer will be supported by any history textbooks you may come across.

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15y ago

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