greatest empires in history | top four of the greatest empires of all time

The Roman Empire reached 5.9 million square kilometers across three continents, with an estimated population of 60 million people.
The Ottoman Empire had a maximum area of 19.9 million square kilometers in areas of the Middle East and Europe.
The British Empire covered 34 million square kilometers, which is approximately a quarter of the world.
The Mongol Empire covered 23 million square kilometers of territory, making it the largest contiguous land empire in history.


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