Conceived by the president of the same name, the Monroe Doctrine of 1823 required an end to European conquest in the Americas. This came in response to European meddling in Alaska and a generally overbearing attitude toward the Americas by European powers. The doctrine also promised that the United States would stay out of European affairs. With his Corollary of 1904, Theodore Roosevelt expanded what Monroe established. Other presidents from Polk to Reagan conducted foreign policy in light of the doctrine.