The United States purchased Alaska from the Russian Empire on March 30, 1867, for $7.2 million, approximately two cents per acre. Secretary of State William H. Seward negotiated the treaty with Russian Minister Eduard de Stoeckl. Russia sought to divest the territory due to declining fur trade revenues and the difficulty of defending a distant colony against British expansion from Canada. The U.S. Senate ratified the treaty on April 9, 1867, by a vote of 37 to 2. The acquisition added 586,412 square miles to U.S. territory.