4) this was initiated in 1919 by the league of nations in order to divide former ottoman and german territories among the victorious allies, but its failure also was a cause of world war ii.

In order to separate former Ottoman and German territories among the victorious Allies Mandate system was started in 1919 by the "League of Nations".

Explanation:

Mandate system was initiated to halt the war and combat over occupied land by taking the land of the collapsed “Ottoman Empire” and the colonies of Germany. The mandate system was created by the “League of Nations” after World War I ended in 1918. The “League of Nations” was formed on the idea of collective security or the concept that by working together to ensure the security of all nations, each nation would, in turn, ensure its own security. At the time, this was then a novel approach to international governance.

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