Summary: Collective Security to enforce world peace, and its failure due to the unattended of Italy, Germany and USA.
Proposed by President Woodrow Wilson
44 states signed the Covenant, including 31 states which had taken part in the war on the side of the Triple Entente or joined it during the conflict.
the United States did not join the League because the refusal of Wilson's opposition in the US senate, particularly from Republican politicians Henry Cabot Lodge and William E. Borah Same as Russia and Germany.