<P> The Alaska Purchase (Russian: Продажа Аляски, tr . Prodazha Alyaski) was the United States' acquisition of Alaska from the Russian Empire on March 30, 1867, by a treaty ratified by the United States Senate, and signed by President Andrew Johnson . </P> <P> Russia wanted to sell its Alaskan territory, fearing that it might be seized if war broke out with the United Kingdom . Russia's primary activities in the territory had been fur trade and missionary work among the Native Alaskans . The land added 586,412 square miles (1,518,800 km) of new territory to the United States . </P>

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