What purchase did Henry seward make in 1867 to increase America's land area?

In 1867, Secretary of State William H. Seward orchestrated the purchase of Alaska from Russia for $7.2 million. This acquisition, often referred to as "Seward's Folly" or "Seward's Icebox," significantly expanded the territory of the United States by adding over 586,000 square miles of land. The purchase was initially criticized but later proved to be strategically and economically beneficial, particularly with the discovery of gold and oil in Alaska.