Who emerged stating among other things that Europeans should not interfere with American nations?

The statement that Europeans should not interfere with American nations is attributed to President James Monroe, who articulated this principle in the Monroe Doctrine of 1823. The doctrine warned European powers against colonization or intervention in the Americas, asserting that the Western Hemisphere was under the influence of the United States. This policy aimed to protect emerging Latin American nations and assert U.S. dominance in the region.