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Alaska is the largest state in the United States by area, the 4th least populous and the least densely populated of the 50 United States. Approximately half of Alaska's residents live within the Anchorage metropolitan area. Alaska was purchased from Russia on March 30, 1867, for $7.2 million at approximately two cents per acre. The land went through several administrative changes before becoming an organized territory on May 11, 1912, and the 49th state of the U.S. on January 3, 1959. The name "Alaska" was already introduced in the Russian colonial period, when it was used only for the peninsula and is derived from the Aleut, meaning "the mainland" or, more literally, "the object towards which the action of the sea is directed". It is also known as Alyeska, the "great land", an Aleut word derived from the same root.