The Second World War broke out during the active years of the League of Nations. The war itself was the proof of the failure of the League’s primary objective- to prevent future wars.
Most of the members of the League did not involve in the war and remained neutral. But some countries chose to go to war.
Germany formed the Axis Powers together with Italy and Japan. The League was not able to efficiently prevent the aggression of the Axis Powers during the war. Soon, Germany, Italy, Japan, Spain and some other countries withdrew from the League.
With these major members leaving and other important countries like the US and the Soviet Union staying out of it, the League began to lose its credibility and its offices were dismantled. It stopped functioning altogether in 1946. The United Nations took shape after that.
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