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The ambitious history of the British Empire 

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The British Empire had millions of slaves.

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According to what I learn, the British Empire (1407-1997) was recognized as the most powerful empire in human history, and was also the largest force on the earth during more than one century. At the peak of its expansion, by 1913, the British Empire held sway over 412 million people, occupied  23% of the world population at the time and held 35,500,000 square kilometers of land in 1920, occupied 24% of the entire land area of the world. It has nearly the same surface area as the Moon. (The surface area of the Moon is 38,000,000 square kilometers). With a combination of colonies, dominions, trust territories and other territories stretching from east to west, the British Empire was truly an empire where the sun never set.

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(1)https://en.wikipedia.org/wiki/Demographics_of_the_British_Empire
(2) https://allfamousbirthday.com/faqs/how-did-the-british-empire-change-the-world/
(3) https://en.wikivoyage.org/wiki/Moon

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I had an strong curiosity and profound impression of the Britain through the quote "The sun never sets on the British Empire" written by a French Celt.
Thus, I spent a lot of time on exploring and figuring out why it was said like that.