Describe the hoover stimson doctrine and it's overall effectiveness?

The Hoover-Stimson Doctrine, articulated by U.S. Secretary of State Henry Stimson in 1932, asserted that the United States would not recognize territorial changes resulting from aggression, specifically in response to Japan's invasion of Manchuria. Its effectiveness was limited, as it failed to deter further Japanese expansion and was largely ignored by the international community. While it underscored a commitment to non-recognition of aggressive acts, the doctrine had little practical impact on preventing conflicts or altering the course of international relations during the interwar period. Overall, it reflected moral opposition to aggression but lacked enforcement mechanisms.