in 1920, after President Woodrow Wilson signed the Treaty of Versailles. However, the US Senate did not ratify the treaty, and ultimately the US did not become a member of the League of Nations. This decision was influenced by concerns about the potential loss of American sovereignty and the belief that the League's collective security system would draw the US into future conflicts. Despite not being a member, the US did cooperate with the League on various issues, such as disarmament and humanitarian efforts.
