How did the failure of the League of Nations contribute to the Second World War?

Failure of the League of Nations led to Second World War, as when the weaker nations appealed to the League to take actions against the aggressors, the only weapon that was available with the League was the economic sanctions. But it proved ineffective against determined aggressors. The league did not take any collective action against Italy's aggression in Ethiopia or Japan's invasion of Manchuria. This led to the failure of the league as no actions were taken against the aggressors. This led Germany to occupy Austria and attack Poland, which ultimately led to the Second World War.