It worked to abolish salvery around the world.
You see, the League of Nations has been proposing various solutions to many of the world crises before the second world war. Yet the League did not prove very effective, since it had no real power to enforce its propositions.
The League of Nations.
The League of Nations mandates were issued to prepare the middle east for independence.
The precursor to the Current United Nations was called the League of Nations. The League of Nations was founded in 1919. When the United Nations was formed in 1945, the League of Nations basically ceased to exist.
Nothing. The League of Nations was the predecessor to the United Nations. (:
There is no League of Nations. We have United Nations
The league of nations was created out of WWI.
The United Nations predecessor organization was the League of Nations which was founded at the end of WW1 as a result of the Treaty of Versailles and managed to attract at its best the participation of 58 countries during 24 September 1934 and 23 February 1935.
The structure of the League of Nations (1920-1946) contained 3 parts. One is the secretariat (General Secretary based in Geneva). The second is the Council and the Assembly and the last were the many agencies and commissions. Please read further at the link I am providing for descriptions of each body.
Original Answer: Because they are decades away. Improved: The United Nations are not a country. They couldn't have "joined" the League of Nations. The League of Nations was the predecessor of the United Nations - the League of Nations failed, and so, many years later in 1942 (I believe it was that year) they founded the United Nations as an improved "League of Nations."
League of Nations
At it's height the League of nations supported 58 members