The aim was to keep world peace and to ensure security.
At its largest there were 58 countries involved with the LoN.
The League of Nations failed as there had to be unanimity for decisions. Unanimity made it really hard for the League to do anything. The League suffered big time from the absence of major powers — Germany, Japan, Italy ultimately left — and the lack of U.S. participation. They also had no army so that meant that when countries were trying to annex one another the League couldn't protect the land.
