The Russian Empire [e] [f] was a vast empire that spanned most of northern Eurasia from its proclamation in November 1721 until the proclamation of the Russian Republic in September 1917. At its height in the late 19th century, it covered about 22,800,000 km 2 (8,800,000 sq mi), roughly one-sixth of the world's landmass, making it the third-largest empire in history, behind only the British ... More @Wikipedia
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