Hello owner, the answer upstairs is correct, I will provide the owner with a detailed description of the incident, I hope to be useful to the owner, thank you! In the northwest corner of North America, there is a vast piece of land, which is adjacent to Canada in the east, bordering the Bering Strait in the west, and north and south is the vast Pacific Ocean and the cold Arctic Ocean. This is Alaska, the 49th state of the United States. It was not originally a U.S. territory, but was purchased from Russia. Alaska's recorded history began in the mid-18th century. As early as 1725, Peter the Great of Russia ordered the Danish navigator Bering to explore whether Asia and America are connected. 1728, Bering first voyage to Alaska, although due to fog can not land, but proved that the continents of Asia and the United States are not connected to each other. 1741, Bering once again sailed from Siberia to the east, in the southern part of Alaska to land. On the return voyage, the ship "St. Peter's" hit the rocks and sank, Bering and 30 crew members were killed, and the survivors returned to Siberia in the following year. The Russians followed, and by the end of the 18th century, Alaska was officially a Russian colony. In the 1820s, the United States proclaimed the Monroe Doctrine that "America is for the Americans" and tried to marginalize other powers from the Western Hemisphere. In the 1820s, the United States declared the Monroe Doctrine that "America is for the Americans" and sought to marginalize other powers from the Western Hemisphere. In March 1867, U.S. Secretary of State William Seward met at his home with the Russian envoy to the U.S., Stoeckel. It turned out that Russia and the United States on the transfer of Alaska has been many secret discussions, the envoy has just received the tsar's decree, agreed to Alaska and the United States to enter into formal negotiations. That night, the U.S. Department of State lights, the negotiations took place overnight, Westward price of 5 million dollars, Stoykel price of 7 million dollars, until 4:00 in the morning, and finally 7 million dollars plus 200,000 U.S. dollars in fees to close the deal. The purchase of such cheap land, in the United States Congress was strongly opposed. Many legislators believe that the civil war has just finished, a lot of waste, financial difficulties, should not spend money to buy a piece of desolate land. The public opinion also thought that buying this piece of frozen land was an incredibly stupid thing to do. After a heated debate, the Senate approved it by a narrow majority. The Czar never dreamed that Alaska, which they had treated as a "bargain" and handled cheaply, would later become a piece of treasure for the United States. Soon after the transfer of Alaska, gold was discovered there, causing a "gold rush" of considerable momentum. After World War II, the United States for the establishment of military bases here and vigorously develop the state. 60's, Alaska and found the largest oil field in North America, at present, the production accounted for the total production of the United States of America 1 / 7. At the same time, it is Japan and the Far East to North America, Northern Europe, the main traffic, but also Asia and the United States the closest place, in the strategic importance of the place. Alaska has a vast land area of 1.6 million square kilometers, which is equivalent to the area of Xinjiang in China, and is as big as 3 France and 7 England. Alaska has also become a paradise for wildlife in North America with its favorable natural conditions and a world tourist destination with its beautiful natural scenery. This story illustrates that land has an extraordinary significance to human beings. It is the foundation of our human existence and is never a commodity that can be measured by its price. In a certain period of time due to the backwardness of science and technology, human beings still do not recognize its value, but with the development of the economy, one day, it will return to mankind with abundant wealth.