Where did the principle that the us has the right to act as a policeman of the western hemisphere and intervene in internal affairs of Latin American nations?

The principle that the U.S. has the right to act as a "policeman" of the Western Hemisphere is largely rooted in the Monroe Doctrine of 1823. This doctrine asserted that any intervention by external powers in the Americas would be viewed as a threat to U.S. security. Over time, the Roosevelt Corollary, added in 1904, expanded this idea, justifying U.S. intervention in Latin American nations to maintain stability and prevent European interference. This framework shaped U.S. foreign policy throughout the 19th and 20th centuries.