Alaska is the largest, least densely populated state in the United States. It was purchased from the Russian Empire on March 30, 1867 for $ 7.2 million and joined the United States. It has a very cold climate. It is believed that the Na-Dene language Indians living in Alaska were descended from the first immigrants who crossed the Bering Land Bridge 15-40 thousand years ago and settled in the American continent. The kinship relations between the Na-Dene languages and the Yenisei languages in Siberia were revealed in 2008 by linguists, especially Edward Vajda. This is the first time that kinship between two continents has been revealed with language data. The Eskimos and Aleuts are probably descendants of the more settled Arctic peoples who came to Alaska 3-8 thousand years ago. The first Europeans in Alaska were Russian fur traders who settled in Three Saints Bay on Kodiak Island in 1784. It is possible to see the influence of Russians in Supiks, the indigenous people of Kodiak, even today. The region was ruled by a Russian-American Company from 1799 to 1867. US Secretary of State William H. Seward signed the document approving the sale of the area to the United States in 1867. The discovery of important gold resources caused large numbers of Americans to settle in Alaska in the 1880s and 1890s, and the U.S. Congress established the Alaskan Territory in 1912. II. The Japanese activity in the region during World War II made it necessary to establish defense facilities in Alaska. Alaska joined the United States on January 3, 1959 as the 49th state. It developed further with the discovery of oil and gas deposits in the Arctic coastal plain in 1968.