League failed in it's main object of maintaining peace in the world. Inspite of it's efforts for two decades, the whole world was involved in a war in 1939. By that time, the machinery of the League of Nations had completely broke down. The failure of League of Nations can be attributed to many causes.
I believe the answer is: Saharan desert
In Hot Desert such as sahara, there is very few water source that organism can use to drink and replenish the fluid in their body, which is why not many animal can afford to cross the Saharan desert.
Camels is the only animal available that could store a Huge amount of water in their hump, which enable them to cross the desert for a very long time without needing to drink.
Checks and balances, principle of government under which separate branches are empowered to prevent actions by other branches and are induced to share power. Checks and balances are applied primarily in constitutional governments.