The U.S. purchased Alaska from Russia for just US$7.2 million in 1867.

Seward and Stoeckl agreed to a treaty on March 30, 1867, and the treaty was ratified by the United States Senate by a wide margin. The purchase added 586,412 square miles (1,518,800 km2) of new territory to the United States for the cost of $7.2 million 1867 dollars.

Image credit: Tim Rains / U.S. National Park Service
Source: wikipedia.org/wiki…