What territory was sold by Russia under Tsar Alexander II, for about 1.9¢ per acre ($4.74/km) a total of US$7.2 million?

Question

After the death of his elder brother Tsar Aleksandr I, Grand Duke Konstantin Pavlovich was declared Emperor of all the Russias on 1 December 1825. How long did his time on the throne last?

Answer 1

Alaska
The United States purchased Alaska from the Russian Empire on March 30, 1867, for 7.2 million U.S. dollars at approximately two cents per acre ($4.74/km2). The area went through several administrative changes before becoming organized as a territory on May 11, 1912. It was admitted as the 49th state of the U.S. on January 3, 1959.