United States takes possession of Alaska after purchasing it from Russia for $7.2 million. Celebrated annually in the state as Alaska Day.
The Russian Empire was an empire that extended across northern Eurasia from 1721 until the proclamation of the Russian Republic in 1917, forming the final era of Tsarist Russia and the wider Russian monarchy. At its height in the late 19th century, it covered about 22,800,000 km2 (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 and Mongol empires.
Watch: The Tsars: Expansion of the Russian Empire | Russia's Wars Ep.1 | Documentary
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Sources and further reading: Wikipedia — Russian Empire, Alaska Purchase, Alaska Day (CC BY-SA). Images: Wikimedia Commons.
