What is territories was purchased by the US in th e1867 for 7.2million (2 cents per acre)?

In 1867, the United States purchased Alaska from Russia for $7.2 million, which amounted to about two cents per acre. This acquisition significantly expanded U.S. territory and provided access to vast Natural Resources. The deal was initially criticized but later proved to be strategically and economically beneficial. Alaska officially became a U.S. territory in 1912 and later a state in 1959.