What was the name of the 1867 deal in which the United States bought Alaska from Russia?

The Alaska Purchase was the 1867 deal in which the United States bought Alaska from Russia.

The treaty was signed in Washington, D.C., on March 30, 1867, for $7.2 million. U.S. Secretary of State William H. Seward negotiated with Russian diplomat Eduard de Stoeckl. The Senate ratified the agreement on May 15, and sovereignty formally transferred at Sitka on October 18.

Some Americans mocked the acquisition as “Seward’s Folly” or “Seward’s Icebox,” believing the territory was remote and economically unpromising. Later discoveries of gold, oil, and other resources changed perceptions. Alaska became a U.S. territory in 1912 and joined the Union as the 49th state in 1959.