What international treaty signed by the US in 1928 outlawed war as an instrument of national policy?

The international treaty signed by the US in 1928 that outlawed war as an instrument of national policy is known as the Kellogg-Briand Pact. Formally titled the Pact of Paris, it was initiated by U.S. Secretary of State Frank B. Kellogg and French Foreign Minister Aristide Briand. The treaty aimed to promote peaceful resolutions to conflicts and condemned recourse to war, although it ultimately lacked enforcement mechanisms and did not prevent future conflicts.