League of nations — first big role model to reduce inequites on world

In 1800s, world population crossed one-billion and in 1919 when league of nations is founded, it was number-one largest initiative/startup to reduce inequities of world, yet it failed to prevent major world-war-2 in mid 20th-century, why it failed? what went wrong? how it happened? these are questions to be analyzed becaz league-of-nations is first big role-model for reducing-world-inequities, Below is picture of headquarters of L-o-N, this reminds us that the headquarters we which built now must not fail to reduce ongoing and future inequties https://en.wikipedia.org/wiki/League_of_Nations